1*35075f95Smpi /* $OpenBSD: nd6.c,v 1.144 2015/08/17 09:58:10 mpi Exp $ */ 2d8a7e3a7Sitojun /* $KAME: nd6.c,v 1.280 2002/06/08 19:52:07 itojun Exp $ */ 3287546eaSitojun 4287546eaSitojun /* 5287546eaSitojun * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6287546eaSitojun * All rights reserved. 7287546eaSitojun * 8287546eaSitojun * Redistribution and use in source and binary forms, with or without 9287546eaSitojun * modification, are permitted provided that the following conditions 10287546eaSitojun * are met: 11287546eaSitojun * 1. Redistributions of source code must retain the above copyright 12287546eaSitojun * notice, this list of conditions and the following disclaimer. 13287546eaSitojun * 2. Redistributions in binary form must reproduce the above copyright 14287546eaSitojun * notice, this list of conditions and the following disclaimer in the 15287546eaSitojun * documentation and/or other materials provided with the distribution. 16287546eaSitojun * 3. Neither the name of the project nor the names of its contributors 17287546eaSitojun * may be used to endorse or promote products derived from this software 18287546eaSitojun * without specific prior written permission. 19287546eaSitojun * 20287546eaSitojun * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21287546eaSitojun * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22287546eaSitojun * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23287546eaSitojun * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24287546eaSitojun * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25287546eaSitojun * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26287546eaSitojun * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27287546eaSitojun * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28287546eaSitojun * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29287546eaSitojun * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30287546eaSitojun * SUCH DAMAGE. 31287546eaSitojun */ 32287546eaSitojun 33287546eaSitojun #include <sys/param.h> 34287546eaSitojun #include <sys/systm.h> 35b3c1e4c1Sitojun #include <sys/timeout.h> 36287546eaSitojun #include <sys/malloc.h> 37287546eaSitojun #include <sys/mbuf.h> 38287546eaSitojun #include <sys/socket.h> 39287546eaSitojun #include <sys/sockio.h> 40287546eaSitojun #include <sys/time.h> 41287546eaSitojun #include <sys/kernel.h> 42f4f4d166Sitojun #include <sys/protosw.h> 43287546eaSitojun #include <sys/errno.h> 44287546eaSitojun #include <sys/ioctl.h> 45287546eaSitojun #include <sys/syslog.h> 46287546eaSitojun #include <sys/queue.h> 47a09574ebSkettenis #include <sys/task.h> 48287546eaSitojun 49287546eaSitojun #include <net/if.h> 50287546eaSitojun #include <net/if_dl.h> 51287546eaSitojun #include <net/if_types.h> 52287546eaSitojun #include <net/route.h> 53287546eaSitojun 54287546eaSitojun #include <netinet/in.h> 55287546eaSitojun #include <netinet/if_ether.h> 56cb39d30aSangelos #include <netinet/ip_ipsp.h> 5758aa7d74Sangelos 58287546eaSitojun #include <netinet6/in6_var.h> 59fa86ee14Sitojun #include <netinet/ip6.h> 60287546eaSitojun #include <netinet6/ip6_var.h> 61287546eaSitojun #include <netinet6/nd6.h> 62fa86ee14Sitojun #include <netinet/icmp6.h> 63287546eaSitojun 64287546eaSitojun #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */ 65287546eaSitojun #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */ 66287546eaSitojun 67287546eaSitojun #define SDL(s) ((struct sockaddr_dl *)s) 68287546eaSitojun 69287546eaSitojun /* timer values */ 70287546eaSitojun int nd6_prune = 1; /* walk list every 1 seconds */ 71287546eaSitojun int nd6_delay = 5; /* delay first probe time 5 second */ 72287546eaSitojun int nd6_umaxtries = 3; /* maximum unicast query */ 73287546eaSitojun int nd6_mmaxtries = 3; /* maximum multicast query */ 74be4e9e12Sitojun int nd6_gctimer = (60 * 60 * 24); /* 1 day: garbage collection timer */ 75287546eaSitojun 76287546eaSitojun /* preventing too many loops in ND option parsing */ 77287546eaSitojun int nd6_maxndopt = 10; /* max # of ND options allowed */ 78287546eaSitojun 79f6e55599Sitojun int nd6_maxnudhint = 0; /* max # of subsequent upper layer hints */ 80f6e55599Sitojun 81b79da24aSitojun #ifdef ND6_DEBUG 82b79da24aSitojun int nd6_debug = 1; 83b79da24aSitojun #else 84b79da24aSitojun int nd6_debug = 0; 85b79da24aSitojun #endif 86b79da24aSitojun 87287546eaSitojun static int nd6_inuse, nd6_allocated; 88287546eaSitojun 89287546eaSitojun struct llinfo_nd6 llinfo_nd6 = {&llinfo_nd6, &llinfo_nd6}; 90f4f4d166Sitojun struct nd_drhead nd_defrouter; 91287546eaSitojun struct nd_prhead nd_prefix = { 0 }; 92287546eaSitojun 93287546eaSitojun int nd6_recalc_reachtm_interval = ND6_RECALC_REACHTM_INTERVAL; 94287546eaSitojun 95a0aa363cSjsing void nd6_setmtu0(struct ifnet *, struct nd_ifinfo *); 96a0aa363cSjsing void nd6_slowtimo(void *); 97a0aa363cSjsing struct llinfo_nd6 *nd6_free(struct rtentry *, int); 98a0aa363cSjsing void nd6_llinfo_timer(void *); 99287546eaSitojun 100b3c1e4c1Sitojun struct timeout nd6_slowtimo_ch; 101b3c1e4c1Sitojun struct timeout nd6_timer_ch; 102a09574ebSkettenis struct task nd6_timer_task; 103e4195480Sdlg void nd6_timer_work(void *); 104b3c1e4c1Sitojun 105a0aa363cSjsing int fill_drlist(void *, size_t *, size_t); 106a0aa363cSjsing int fill_prlist(void *, size_t *, size_t); 107d8a7e3a7Sitojun 108f3fcf2f3Smcbride #define LN_DEQUEUE(ln) do { \ 109f3fcf2f3Smcbride (ln)->ln_next->ln_prev = (ln)->ln_prev; \ 110f3fcf2f3Smcbride (ln)->ln_prev->ln_next = (ln)->ln_next; \ 111f3fcf2f3Smcbride } while (0) 112f3fcf2f3Smcbride #define LN_INSERTHEAD(ln) do { \ 113f3fcf2f3Smcbride (ln)->ln_next = llinfo_nd6.ln_next; \ 114f3fcf2f3Smcbride llinfo_nd6.ln_next = (ln); \ 115f3fcf2f3Smcbride (ln)->ln_prev = &llinfo_nd6; \ 116f3fcf2f3Smcbride (ln)->ln_next->ln_prev = (ln); \ 117f3fcf2f3Smcbride } while (0) 118f3fcf2f3Smcbride 119287546eaSitojun void 120a0aa363cSjsing nd6_init(void) 121287546eaSitojun { 122287546eaSitojun static int nd6_init_done = 0; 123287546eaSitojun 124287546eaSitojun if (nd6_init_done) { 125*35075f95Smpi log(LOG_NOTICE, "%s called more than once\n", __func__); 126287546eaSitojun return; 127287546eaSitojun } 128287546eaSitojun 129f4f4d166Sitojun /* initialization of the default router list */ 130f4f4d166Sitojun TAILQ_INIT(&nd_defrouter); 131f4f4d166Sitojun 132e4195480Sdlg task_set(&nd6_timer_task, nd6_timer_work, NULL); 133a09574ebSkettenis 134287546eaSitojun nd6_init_done = 1; 135287546eaSitojun 136287546eaSitojun /* start timer */ 137b3c1e4c1Sitojun timeout_set(&nd6_slowtimo_ch, nd6_slowtimo, NULL); 13829e86e5eSblambert timeout_add_sec(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL); 139110585f2Sflorian 14060968cbeSmpi nd6_rs_init(); 141287546eaSitojun } 142287546eaSitojun 143d6b9e9b9Sitojun struct nd_ifinfo * 144ee37ea65Smcbride nd6_ifattach(struct ifnet *ifp) 145287546eaSitojun { 146d6b9e9b9Sitojun struct nd_ifinfo *nd; 147287546eaSitojun 148393af863Skrw nd = malloc(sizeof(*nd), M_IP6NDP, M_WAITOK | M_ZERO); 149287546eaSitojun 150d6b9e9b9Sitojun nd->initialized = 1; 151287546eaSitojun 152d6b9e9b9Sitojun nd->chlim = IPV6_DEFHLIM; 153d6b9e9b9Sitojun nd->basereachable = REACHABLE_TIME; 154d6b9e9b9Sitojun nd->reachable = ND_COMPUTE_RTIME(nd->basereachable); 155d6b9e9b9Sitojun nd->retrans = RETRANS_TIMER; 1562a4a63f1Shenning /* per-interface IFXF_AUTOCONF6 needs to be set too to accept RAs */ 157d8a7e3a7Sitojun nd->flags = (ND6_IFF_PERFORMNUD | ND6_IFF_ACCEPT_RTADV); 1581b5f410aSitojun 1591b5f410aSitojun /* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */ 1601b5f410aSitojun nd6_setmtu0(ifp, nd); 161d6b9e9b9Sitojun 162d6b9e9b9Sitojun return nd; 163287546eaSitojun } 164287546eaSitojun 165d6b9e9b9Sitojun void 166ee37ea65Smcbride nd6_ifdetach(struct nd_ifinfo *nd) 167d6b9e9b9Sitojun { 168d374aaacSitojun 169dd168dc2Stedu free(nd, M_IP6NDP, 0); 170287546eaSitojun } 171287546eaSitojun 172287546eaSitojun void 173ee37ea65Smcbride nd6_setmtu(struct ifnet *ifp) 1741b5f410aSitojun { 1751b5f410aSitojun nd6_setmtu0(ifp, ND_IFINFO(ifp)); 1761b5f410aSitojun } 1771b5f410aSitojun 1781b5f410aSitojun void 179ee37ea65Smcbride nd6_setmtu0(struct ifnet *ifp, struct nd_ifinfo *ndi) 180287546eaSitojun { 1811b5f410aSitojun u_int32_t omaxmtu; 1821b5f410aSitojun 1831b5f410aSitojun omaxmtu = ndi->maxmtu; 184287546eaSitojun ndi->maxmtu = ifp->if_mtu; 185287546eaSitojun 1861b5f410aSitojun /* 1871b5f410aSitojun * Decreasing the interface MTU under IPV6 minimum MTU may cause 1881b5f410aSitojun * undesirable situation. We thus notify the operator of the change 1891b5f410aSitojun * explicitly. The check for omaxmtu is necessary to restrict the 1901b5f410aSitojun * log to the case of changing the MTU, not initializing it. 1911b5f410aSitojun */ 1921b5f410aSitojun if (omaxmtu >= IPV6_MMTU && ndi->maxmtu < IPV6_MMTU) { 193*35075f95Smpi log(LOG_NOTICE, "%s: link MTU on %s (%lu) too small for IPv6\n", 194*35075f95Smpi __func__, ifp->if_xname, (unsigned long)ndi->maxmtu); 195287546eaSitojun } 196287546eaSitojun } 197287546eaSitojun 198287546eaSitojun void 199ee37ea65Smcbride nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts) 200287546eaSitojun { 201287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 202287546eaSitojun ndopts->nd_opts_search = (struct nd_opt_hdr *)opt; 203287546eaSitojun ndopts->nd_opts_last 204287546eaSitojun = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len); 205287546eaSitojun 206287546eaSitojun if (icmp6len == 0) { 207287546eaSitojun ndopts->nd_opts_done = 1; 208287546eaSitojun ndopts->nd_opts_search = NULL; 209287546eaSitojun } 210287546eaSitojun } 211287546eaSitojun 212287546eaSitojun /* 213287546eaSitojun * Take one ND option. 214287546eaSitojun */ 215287546eaSitojun struct nd_opt_hdr * 216ee37ea65Smcbride nd6_option(union nd_opts *ndopts) 217287546eaSitojun { 218287546eaSitojun struct nd_opt_hdr *nd_opt; 219287546eaSitojun int olen; 220287546eaSitojun 221287546eaSitojun if (!ndopts) 222bc84bce2Skrw panic("ndopts == NULL in nd6_option"); 223287546eaSitojun if (!ndopts->nd_opts_last) 224bc84bce2Skrw panic("uninitialized ndopts in nd6_option"); 225287546eaSitojun if (!ndopts->nd_opts_search) 226287546eaSitojun return NULL; 227287546eaSitojun if (ndopts->nd_opts_done) 228287546eaSitojun return NULL; 229287546eaSitojun 230287546eaSitojun nd_opt = ndopts->nd_opts_search; 231287546eaSitojun 23215bd77d2Sitojun /* make sure nd_opt_len is inside the buffer */ 23315bd77d2Sitojun if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) { 23415bd77d2Sitojun bzero(ndopts, sizeof(*ndopts)); 23515bd77d2Sitojun return NULL; 23615bd77d2Sitojun } 23715bd77d2Sitojun 238287546eaSitojun olen = nd_opt->nd_opt_len << 3; 239287546eaSitojun if (olen == 0) { 240287546eaSitojun /* 241287546eaSitojun * Message validation requires that all included 242287546eaSitojun * options have a length that is greater than zero. 243287546eaSitojun */ 244287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 245287546eaSitojun return NULL; 246287546eaSitojun } 247287546eaSitojun 248287546eaSitojun ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen); 24915bd77d2Sitojun if (ndopts->nd_opts_search > ndopts->nd_opts_last) { 25015bd77d2Sitojun /* option overruns the end of buffer, invalid */ 25115bd77d2Sitojun bzero(ndopts, sizeof(*ndopts)); 25215bd77d2Sitojun return NULL; 25315bd77d2Sitojun } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) { 25415bd77d2Sitojun /* reached the end of options chain */ 255287546eaSitojun ndopts->nd_opts_done = 1; 256287546eaSitojun ndopts->nd_opts_search = NULL; 257287546eaSitojun } 258287546eaSitojun return nd_opt; 259287546eaSitojun } 260287546eaSitojun 261287546eaSitojun /* 262287546eaSitojun * Parse multiple ND options. 263287546eaSitojun * This function is much easier to use, for ND routines that do not need 264287546eaSitojun * multiple options of the same type. 265287546eaSitojun */ 266287546eaSitojun int 267ee37ea65Smcbride nd6_options(union nd_opts *ndopts) 268287546eaSitojun { 269287546eaSitojun struct nd_opt_hdr *nd_opt; 270287546eaSitojun int i = 0; 271287546eaSitojun 272287546eaSitojun if (!ndopts) 273bc84bce2Skrw panic("ndopts == NULL in nd6_options"); 274287546eaSitojun if (!ndopts->nd_opts_last) 275bc84bce2Skrw panic("uninitialized ndopts in nd6_options"); 276287546eaSitojun if (!ndopts->nd_opts_search) 277287546eaSitojun return 0; 278287546eaSitojun 279287546eaSitojun while (1) { 280287546eaSitojun nd_opt = nd6_option(ndopts); 281287546eaSitojun if (!nd_opt && !ndopts->nd_opts_last) { 282287546eaSitojun /* 283287546eaSitojun * Message validation requires that all included 284287546eaSitojun * options have a length that is greater than zero. 285287546eaSitojun */ 286b79da24aSitojun icmp6stat.icp6s_nd_badopt++; 287287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 288287546eaSitojun return -1; 289287546eaSitojun } 290287546eaSitojun 291287546eaSitojun if (!nd_opt) 292287546eaSitojun goto skip1; 293287546eaSitojun 294287546eaSitojun switch (nd_opt->nd_opt_type) { 295287546eaSitojun case ND_OPT_SOURCE_LINKADDR: 296287546eaSitojun case ND_OPT_TARGET_LINKADDR: 297287546eaSitojun case ND_OPT_MTU: 298287546eaSitojun case ND_OPT_REDIRECTED_HEADER: 299287546eaSitojun if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { 30015bd77d2Sitojun nd6log((LOG_INFO, 30115bd77d2Sitojun "duplicated ND6 option found (type=%d)\n", 30215bd77d2Sitojun nd_opt->nd_opt_type)); 303287546eaSitojun /* XXX bark? */ 304287546eaSitojun } else { 305287546eaSitojun ndopts->nd_opt_array[nd_opt->nd_opt_type] 306287546eaSitojun = nd_opt; 307287546eaSitojun } 308287546eaSitojun break; 309287546eaSitojun case ND_OPT_PREFIX_INFORMATION: 310287546eaSitojun if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) { 311287546eaSitojun ndopts->nd_opt_array[nd_opt->nd_opt_type] 312287546eaSitojun = nd_opt; 313287546eaSitojun } 314287546eaSitojun ndopts->nd_opts_pi_end = 315287546eaSitojun (struct nd_opt_prefix_info *)nd_opt; 316287546eaSitojun break; 317287546eaSitojun default: 318287546eaSitojun /* 319287546eaSitojun * Unknown options must be silently ignored, 320e4d25771Stodd * to accommodate future extension to the protocol. 321287546eaSitojun */ 322b79da24aSitojun nd6log((LOG_DEBUG, 323287546eaSitojun "nd6_options: unsupported option %d - " 324b79da24aSitojun "option ignored\n", nd_opt->nd_opt_type)); 325287546eaSitojun } 326287546eaSitojun 327287546eaSitojun skip1: 328287546eaSitojun i++; 329287546eaSitojun if (i > nd6_maxndopt) { 330287546eaSitojun icmp6stat.icp6s_nd_toomanyopt++; 331b79da24aSitojun nd6log((LOG_INFO, "too many loop in nd opt\n")); 332287546eaSitojun break; 333287546eaSitojun } 334287546eaSitojun 335287546eaSitojun if (ndopts->nd_opts_done) 336287546eaSitojun break; 337287546eaSitojun } 338287546eaSitojun 339287546eaSitojun return 0; 340287546eaSitojun } 341287546eaSitojun 342287546eaSitojun /* 3439631a17bSitojun * ND6 timer routine to handle ND6 entries 344287546eaSitojun */ 345287546eaSitojun void 3469631a17bSitojun nd6_llinfo_settimer(struct llinfo_nd6 *ln, long tick) 3479631a17bSitojun { 3489631a17bSitojun int s; 3499631a17bSitojun 3509631a17bSitojun s = splsoftnet(); 3519631a17bSitojun 3529631a17bSitojun if (tick < 0) { 3539631a17bSitojun ln->ln_expire = 0; 3549631a17bSitojun ln->ln_ntick = 0; 3559631a17bSitojun timeout_del(&ln->ln_timer_ch); 3569631a17bSitojun } else { 3573212dc31Stholo ln->ln_expire = time_second + tick / hz; 3589631a17bSitojun if (tick > INT_MAX) { 3599631a17bSitojun ln->ln_ntick = tick - INT_MAX; 3609631a17bSitojun timeout_add(&ln->ln_timer_ch, INT_MAX); 3619631a17bSitojun } else { 3629631a17bSitojun ln->ln_ntick = 0; 3639631a17bSitojun timeout_add(&ln->ln_timer_ch, tick); 3649631a17bSitojun } 3659631a17bSitojun } 3669631a17bSitojun 3679631a17bSitojun splx(s); 3689631a17bSitojun } 3699631a17bSitojun 370a0aa363cSjsing void 3719631a17bSitojun nd6_llinfo_timer(void *arg) 372287546eaSitojun { 373287546eaSitojun int s; 374b3c1e4c1Sitojun struct llinfo_nd6 *ln; 375287546eaSitojun struct rtentry *rt; 376287546eaSitojun struct sockaddr_in6 *dst; 3779631a17bSitojun struct ifnet *ifp; 378d374aaacSitojun struct nd_ifinfo *ndi = NULL; 379287546eaSitojun 3809631a17bSitojun s = splsoftnet(); 3819631a17bSitojun 3829631a17bSitojun ln = (struct llinfo_nd6 *)arg; 3839631a17bSitojun 3849631a17bSitojun if (ln->ln_ntick > 0) { 3859631a17bSitojun if (ln->ln_ntick > INT_MAX) { 3869631a17bSitojun ln->ln_ntick -= INT_MAX; 3879631a17bSitojun nd6_llinfo_settimer(ln, INT_MAX); 3889631a17bSitojun } else { 3899631a17bSitojun ln->ln_ntick = 0; 3909631a17bSitojun nd6_llinfo_settimer(ln, ln->ln_ntick); 391287546eaSitojun } 3929631a17bSitojun splx(s); 3939631a17bSitojun return; 394287546eaSitojun } 3959631a17bSitojun 3969631a17bSitojun if ((rt = ln->ln_rt) == NULL) 3979631a17bSitojun panic("ln->ln_rt == NULL"); 3989631a17bSitojun if ((ifp = rt->rt_ifp) == NULL) 3999631a17bSitojun panic("ln->ln_rt->rt_ifp == NULL"); 400d6b9e9b9Sitojun ndi = ND_IFINFO(ifp); 401c3c56496Sbluhm dst = satosin6(rt_key(rt)); 402287546eaSitojun 403287546eaSitojun /* sanity check */ 404d374aaacSitojun if (rt->rt_llinfo && (struct llinfo_nd6 *)rt->rt_llinfo != ln) 405bc84bce2Skrw panic("rt_llinfo(%p) is not equal to ln(%p)", 406d374aaacSitojun rt->rt_llinfo, ln); 407287546eaSitojun if (!dst) 408bc84bce2Skrw panic("dst=0 in nd6_timer(ln=%p)", ln); 409287546eaSitojun 410287546eaSitojun switch (ln->ln_state) { 411287546eaSitojun case ND6_LLINFO_INCOMPLETE: 412287546eaSitojun if (ln->ln_asked < nd6_mmaxtries) { 413287546eaSitojun ln->ln_asked++; 4149631a17bSitojun nd6_llinfo_settimer(ln, (long)ndi->retrans * hz / 1000); 4159631a17bSitojun nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0); 416287546eaSitojun } else { 417287546eaSitojun struct mbuf *m = ln->ln_hold; 418287546eaSitojun if (m) { 4198294a4dfSitojun ln->ln_hold = NULL; 420287546eaSitojun /* 421d8a7e3a7Sitojun * Fake rcvif to make the ICMP error 422d8a7e3a7Sitojun * more helpful in diagnosing for the 423d8a7e3a7Sitojun * receiver. 424287546eaSitojun * XXX: should we consider 425287546eaSitojun * older rcvif? 426287546eaSitojun */ 427fb492c37Smpi m->m_pkthdr.ph_ifidx = rt->rt_ifp->if_index; 428d8a7e3a7Sitojun 429287546eaSitojun icmp6_error(m, ICMP6_DST_UNREACH, 430287546eaSitojun ICMP6_DST_UNREACH_ADDR, 0); 431e212adedSkrw if (ln->ln_hold == m) { 432e212adedSkrw /* m is back in ln_hold. Discard. */ 433e212adedSkrw m_freem(ln->ln_hold); 434e212adedSkrw ln->ln_hold = NULL; 435e212adedSkrw } 436287546eaSitojun } 4379631a17bSitojun (void)nd6_free(rt, 0); 4389631a17bSitojun ln = NULL; 439287546eaSitojun } 440287546eaSitojun break; 441287546eaSitojun case ND6_LLINFO_REACHABLE: 4429631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 443287546eaSitojun ln->ln_state = ND6_LLINFO_STALE; 4449631a17bSitojun nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 445be4e9e12Sitojun } 446287546eaSitojun break; 447be4e9e12Sitojun 448be4e9e12Sitojun case ND6_LLINFO_STALE: 449f3fcf2f3Smcbride case ND6_LLINFO_PURGE: 450be4e9e12Sitojun /* Garbage Collection(RFC 2461 5.3) */ 4519631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 4529631a17bSitojun (void)nd6_free(rt, 1); 4539631a17bSitojun ln = NULL; 4549631a17bSitojun } 455be4e9e12Sitojun break; 456be4e9e12Sitojun 457287546eaSitojun case ND6_LLINFO_DELAY: 458d374aaacSitojun if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) { 459d374aaacSitojun /* We need NUD */ 460287546eaSitojun ln->ln_asked = 1; 461287546eaSitojun ln->ln_state = ND6_LLINFO_PROBE; 4629631a17bSitojun nd6_llinfo_settimer(ln, (long)ndi->retrans * hz / 1000); 463d374aaacSitojun nd6_ns_output(ifp, &dst->sin6_addr, 464d8a7e3a7Sitojun &dst->sin6_addr, ln, 0); 465be4e9e12Sitojun } else { 466d374aaacSitojun ln->ln_state = ND6_LLINFO_STALE; /* XXX */ 4679631a17bSitojun nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 468be4e9e12Sitojun } 469287546eaSitojun break; 470287546eaSitojun case ND6_LLINFO_PROBE: 471287546eaSitojun if (ln->ln_asked < nd6_umaxtries) { 472287546eaSitojun ln->ln_asked++; 4739631a17bSitojun nd6_llinfo_settimer(ln, (long)ndi->retrans * hz / 1000); 474287546eaSitojun nd6_ns_output(ifp, &dst->sin6_addr, 475287546eaSitojun &dst->sin6_addr, ln, 0); 476d8a7e3a7Sitojun } else { 4779631a17bSitojun (void)nd6_free(rt, 0); 4789631a17bSitojun ln = NULL; 479d8a7e3a7Sitojun } 480287546eaSitojun break; 481287546eaSitojun } 4829631a17bSitojun 4839631a17bSitojun splx(s); 484287546eaSitojun } 485287546eaSitojun 4869631a17bSitojun /* 4879631a17bSitojun * ND6 timer routine to expire default route list and prefix list 4889631a17bSitojun */ 4899631a17bSitojun void 490e4195480Sdlg nd6_timer_work(void *null) 4919631a17bSitojun { 4929631a17bSitojun int s; 493568012e6Sbluhm struct nd_defrouter *dr, *ndr; 494119a433cSbluhm struct nd_prefix *pr, *npr; 4959631a17bSitojun struct in6_ifaddr *ia6, *nia6; 4969631a17bSitojun 4979631a17bSitojun s = splsoftnet(); 4989631a17bSitojun timeout_set(&nd6_timer_ch, nd6_timer, NULL); 49929e86e5eSblambert timeout_add_sec(&nd6_timer_ch, nd6_prune); 5009631a17bSitojun 5010a2c5741Sitojun /* expire default router list */ 502568012e6Sbluhm TAILQ_FOREACH_SAFE(dr, &nd_defrouter, dr_entry, ndr) 503568012e6Sbluhm if (dr->expire && dr->expire < time_second) 504287546eaSitojun defrtrlist_del(dr); 505287546eaSitojun 506287546eaSitojun /* 507d8a7e3a7Sitojun * expire interface addresses. 508d8a7e3a7Sitojun * in the past the loop was inside prefix expiry processing. 5098b542bbeSpascoe * However, from a stricter spec-conformance standpoint, we should 510d8a7e3a7Sitojun * rather separate address lifetimes and prefix lifetimes. 511d8a7e3a7Sitojun */ 512a0fa8079Smpi TAILQ_FOREACH_SAFE(ia6, &in6_ifaddr, ia_list, nia6) { 513d8a7e3a7Sitojun /* check address lifetime */ 514d8a7e3a7Sitojun if (IFA6_IS_INVALID(ia6)) { 515d8a7e3a7Sitojun in6_purgeaddr(&ia6->ia_ifa); 5160a8b9475Smarkus } else if (IFA6_IS_DEPRECATED(ia6)) { 517d8a7e3a7Sitojun ia6->ia6_flags |= IN6_IFF_DEPRECATED; 518d8a7e3a7Sitojun } else { 519d8a7e3a7Sitojun /* 520d8a7e3a7Sitojun * A new RA might have made a deprecated address 521d8a7e3a7Sitojun * preferred. 522d8a7e3a7Sitojun */ 523d8a7e3a7Sitojun ia6->ia6_flags &= ~IN6_IFF_DEPRECATED; 524d8a7e3a7Sitojun } 525d8a7e3a7Sitojun } 526d8a7e3a7Sitojun 527d8a7e3a7Sitojun /* expire prefix list */ 528119a433cSbluhm LIST_FOREACH_SAFE(pr, &nd_prefix, ndpr_entry, npr) { 529d8a7e3a7Sitojun /* 530287546eaSitojun * check prefix lifetime. 531287546eaSitojun * since pltime is just for autoconf, pltime processing for 532287546eaSitojun * prefix is not necessary. 533287546eaSitojun */ 534d8a7e3a7Sitojun if (pr->ndpr_vltime != ND6_INFINITE_LIFETIME && 5353212dc31Stholo time_second - pr->ndpr_lastupdate > pr->ndpr_vltime) { 536287546eaSitojun /* 537287546eaSitojun * address expiration and prefix expiration are 538d8a7e3a7Sitojun * separate. NEVER perform in6_purgeaddr here. 539287546eaSitojun */ 540287546eaSitojun 541287546eaSitojun prelist_remove(pr); 542119a433cSbluhm } 543287546eaSitojun } 544287546eaSitojun splx(s); 545287546eaSitojun } 546287546eaSitojun 547a09574ebSkettenis void 548a09574ebSkettenis nd6_timer(void *ignored_arg) 549a09574ebSkettenis { 550a09574ebSkettenis task_add(systq, &nd6_timer_task); 551a09574ebSkettenis } 552a09574ebSkettenis 55322770369Sitojun /* 55422770369Sitojun * Nuke neighbor cache/prefix/default router management table, right before 55522770369Sitojun * ifp goes away. 55622770369Sitojun */ 55722770369Sitojun void 558ee37ea65Smcbride nd6_purge(struct ifnet *ifp) 55922770369Sitojun { 56022770369Sitojun struct llinfo_nd6 *ln, *nln; 561d8a7e3a7Sitojun struct nd_defrouter *dr, *ndr; 56222770369Sitojun struct nd_prefix *pr, *npr; 56322770369Sitojun 56422770369Sitojun /* 565d8a7e3a7Sitojun * Nuke default router list entries toward ifp. 566d8a7e3a7Sitojun * We defer removal of default router list entries that is installed 567d8a7e3a7Sitojun * in the routing table, in order to keep additional side effects as 568d8a7e3a7Sitojun * small as possible. 56922770369Sitojun */ 570568012e6Sbluhm TAILQ_FOREACH_SAFE(dr, &nd_defrouter, dr_entry, ndr) { 571d8a7e3a7Sitojun if (dr->installed) 572d8a7e3a7Sitojun continue; 573d8a7e3a7Sitojun 57422770369Sitojun if (dr->ifp == ifp) 57522770369Sitojun defrtrlist_del(dr); 57622770369Sitojun } 577568012e6Sbluhm TAILQ_FOREACH_SAFE(dr, &nd_defrouter, dr_entry, ndr) { 578d8a7e3a7Sitojun if (!dr->installed) 579d8a7e3a7Sitojun continue; 580d8a7e3a7Sitojun 58122770369Sitojun if (dr->ifp == ifp) 58222770369Sitojun defrtrlist_del(dr); 58322770369Sitojun } 58422770369Sitojun 58522770369Sitojun /* Nuke prefix list entries toward ifp */ 586119a433cSbluhm LIST_FOREACH_SAFE(pr, &nd_prefix, ndpr_entry, npr) { 587e520a0ecSmpi if (pr->ndpr_ifp == ifp) 58822770369Sitojun prelist_remove(pr); 58922770369Sitojun } 59022770369Sitojun 591d3b1c214Sflorian if (ifp->if_xflags & IFXF_AUTOCONF6) { 59222770369Sitojun /* refresh default router list */ 593f4f4d166Sitojun defrouter_select(); 594e6e438a4Sitojun } 59522770369Sitojun 59622770369Sitojun /* 59722770369Sitojun * Nuke neighbor cache entries for the ifp. 59822770369Sitojun * Note that rt->rt_ifp may not be the same as ifp, 59922770369Sitojun * due to KAME goto ours hack. See RTM_RESOLVE case in 60022770369Sitojun * nd6_rtrequest(), and ip6_input(). 60122770369Sitojun */ 60222770369Sitojun ln = llinfo_nd6.ln_next; 60322770369Sitojun while (ln && ln != &llinfo_nd6) { 60422770369Sitojun struct rtentry *rt; 60522770369Sitojun struct sockaddr_dl *sdl; 60622770369Sitojun 60722770369Sitojun nln = ln->ln_next; 60822770369Sitojun rt = ln->ln_rt; 60922770369Sitojun if (rt && rt->rt_gateway && 61022770369Sitojun rt->rt_gateway->sa_family == AF_LINK) { 61122770369Sitojun sdl = (struct sockaddr_dl *)rt->rt_gateway; 61222770369Sitojun if (sdl->sdl_index == ifp->if_index) 613d8a7e3a7Sitojun nln = nd6_free(rt, 0); 61422770369Sitojun } 61522770369Sitojun ln = nln; 61622770369Sitojun } 61722770369Sitojun } 61822770369Sitojun 619287546eaSitojun struct rtentry * 620f4d1af37Smikeb nd6_lookup(struct in6_addr *addr6, int create, struct ifnet *ifp, 621f4d1af37Smikeb u_int rtableid) 622287546eaSitojun { 623287546eaSitojun struct rtentry *rt; 624287546eaSitojun struct sockaddr_in6 sin6; 6255148b194Smpi int flags; 626287546eaSitojun 627287546eaSitojun bzero(&sin6, sizeof(sin6)); 628287546eaSitojun sin6.sin6_len = sizeof(struct sockaddr_in6); 629287546eaSitojun sin6.sin6_family = AF_INET6; 630287546eaSitojun sin6.sin6_addr = *addr6; 6315148b194Smpi flags = (create) ? (RT_REPORT|RT_RESOLVE) : 0; 632d8a7e3a7Sitojun 6335148b194Smpi rt = rtalloc(sin6tosa(&sin6), flags, rtableid); 634287546eaSitojun if (rt && (rt->rt_flags & RTF_LLINFO) == 0) { 635287546eaSitojun /* 636287546eaSitojun * This is the case for the default route. 637287546eaSitojun * If we want to create a neighbor cache for the address, we 638287546eaSitojun * should free the route for the destination and allocate an 639287546eaSitojun * interface route. 640287546eaSitojun */ 641287546eaSitojun if (create) { 64227ae666cSmpi rtfree(rt); 64327ae666cSmpi rt = NULL; 644287546eaSitojun } 645287546eaSitojun } 646287546eaSitojun if (!rt) { 647287546eaSitojun if (create && ifp) { 648cb24f5e5Sclaudio struct rt_addrinfo info; 649d374aaacSitojun int e; 650d374aaacSitojun 651287546eaSitojun /* 652287546eaSitojun * If no route is available and create is set, 653287546eaSitojun * we allocate a host route for the destination 654287546eaSitojun * and treat it like an interface route. 655287546eaSitojun * This hack is necessary for a neighbor which can't 656287546eaSitojun * be covered by our own prefix. 657287546eaSitojun */ 658287546eaSitojun struct ifaddr *ifa = 659c3c56496Sbluhm ifaof_ifpforaddr(sin6tosa(&sin6), ifp); 660287546eaSitojun if (ifa == NULL) 661287546eaSitojun return (NULL); 662287546eaSitojun 663287546eaSitojun /* 664287546eaSitojun * Create a new route. RTF_LLINFO is necessary 665287546eaSitojun * to create a Neighbor Cache entry for the 666287546eaSitojun * destination in nd6_rtrequest which will be 667cb24f5e5Sclaudio * called in rtrequest1 via ifa->ifa_rtrequest. 668287546eaSitojun */ 669cb24f5e5Sclaudio bzero(&info, sizeof(info)); 67024801294Smpi info.rti_flags = RTF_UP | RTF_HOST | RTF_LLINFO; 671c3c56496Sbluhm info.rti_info[RTAX_DST] = sin6tosa(&sin6); 67242e62351Smpi info.rti_info[RTAX_GATEWAY] = 67342e62351Smpi (struct sockaddr *)ifp->if_sadl; 674cb24f5e5Sclaudio if ((e = rtrequest1(RTM_ADD, &info, RTP_CONNECTED, 675f4d1af37Smikeb &rt, rtableid)) != 0) { 676d8a7e3a7Sitojun #if 0 677bbcf0337Smpi char ip[INET6_ADDRSTRLEN]; 678*35075f95Smpi log(LOG_ERR, "%s: failed to add route for a " 679*35075f95Smpi "neighbor(%s), errno=%d\n", __func__, 680bbcf0337Smpi inet_ntop(AF_INET6, addr6, ip, sizeof(ip)), 681bbcf0337Smpi e); 682d8a7e3a7Sitojun #endif 683d8a7e3a7Sitojun return (NULL); 684d8a7e3a7Sitojun } 685287546eaSitojun if (rt == NULL) 686287546eaSitojun return (NULL); 687287546eaSitojun if (rt->rt_llinfo) { 688287546eaSitojun struct llinfo_nd6 *ln = 689287546eaSitojun (struct llinfo_nd6 *)rt->rt_llinfo; 690287546eaSitojun ln->ln_state = ND6_LLINFO_NOSTATE; 691287546eaSitojun } 692f6e55599Sitojun } else 693287546eaSitojun return (NULL); 694287546eaSitojun } 695287546eaSitojun rt->rt_refcnt--; 696287546eaSitojun /* 697287546eaSitojun * Validation for the entry. 698d8a7e3a7Sitojun * Note that the check for rt_llinfo is necessary because a cloned 699d8a7e3a7Sitojun * route from a parent route that has the L flag (e.g. the default 700d8a7e3a7Sitojun * route to a p2p interface) may have the flag, too, while the 701d8a7e3a7Sitojun * destination is not actually a neighbor. 702287546eaSitojun * XXX: we can't use rt->rt_ifp to check for the interface, since 703287546eaSitojun * it might be the loopback interface if the entry is for our 704287546eaSitojun * own address on a non-loopback interface. Instead, we should 705d8a7e3a7Sitojun * use rt->rt_ifa->ifa_ifp, which would specify the REAL 706d8a7e3a7Sitojun * interface. 707287546eaSitojun */ 708287546eaSitojun if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 || 709d8a7e3a7Sitojun rt->rt_gateway->sa_family != AF_LINK || rt->rt_llinfo == NULL || 710287546eaSitojun (ifp && rt->rt_ifa->ifa_ifp != ifp)) { 711287546eaSitojun if (create) { 712bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 713*35075f95Smpi nd6log((LOG_DEBUG, "%s: failed to lookup %s (if=%s)\n", 714*35075f95Smpi __func__, 715bbcf0337Smpi inet_ntop(AF_INET6, addr6, addr, sizeof(addr)), 716da592434Sitojun ifp ? ifp->if_xname : "unspec")); 717287546eaSitojun } 718d8a7e3a7Sitojun return (NULL); 719287546eaSitojun } 720287546eaSitojun return (rt); 721287546eaSitojun } 722287546eaSitojun 723287546eaSitojun /* 724287546eaSitojun * Detect if a given IPv6 address identifies a neighbor on a given link. 725287546eaSitojun * XXX: should take care of the destination of a p2p link? 726287546eaSitojun */ 727287546eaSitojun int 728ee37ea65Smcbride nd6_is_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp) 729287546eaSitojun { 730d8a7e3a7Sitojun struct nd_prefix *pr; 731d8a7e3a7Sitojun struct rtentry *rt; 732287546eaSitojun 733cfb6b8dfSitojun /* 734cfb6b8dfSitojun * A link-local address is always a neighbor. 735cfb6b8dfSitojun * XXX: we should use the sin6_scope_id field rather than the embedded 736cfb6b8dfSitojun * interface index. 737d8a7e3a7Sitojun * XXX: a link does not necessarily specify a single interface. 738cfb6b8dfSitojun */ 739cfb6b8dfSitojun if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr) && 740cfb6b8dfSitojun ntohs(*(u_int16_t *)&addr->sin6_addr.s6_addr[2]) == ifp->if_index) 741287546eaSitojun return (1); 742287546eaSitojun 743287546eaSitojun /* 744d8a7e3a7Sitojun * If the address matches one of our on-link prefixes, it should be a 745d8a7e3a7Sitojun * neighbor. 746287546eaSitojun */ 747545205eaSpyr LIST_FOREACH(pr, &nd_prefix, ndpr_entry) { 748d8a7e3a7Sitojun if (pr->ndpr_ifp != ifp) 749d8a7e3a7Sitojun continue; 750287546eaSitojun 751d8a7e3a7Sitojun if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) 752d8a7e3a7Sitojun continue; 753d8a7e3a7Sitojun 754d8a7e3a7Sitojun if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr, 755d8a7e3a7Sitojun &addr->sin6_addr, &pr->ndpr_mask)) 756d8a7e3a7Sitojun return (1); 757287546eaSitojun } 758d8a7e3a7Sitojun 759d8a7e3a7Sitojun /* 760287546eaSitojun * Even if the address matches none of our addresses, it might be 761287546eaSitojun * in the neighbor cache. 762287546eaSitojun */ 763f4d1af37Smikeb if ((rt = nd6_lookup(&addr->sin6_addr, 0, ifp, 764f4d1af37Smikeb ifp->if_rdomain)) != NULL) 765287546eaSitojun return (1); 766287546eaSitojun 767287546eaSitojun return (0); 768287546eaSitojun } 769287546eaSitojun 770287546eaSitojun /* 771287546eaSitojun * Free an nd6 llinfo entry. 772d8a7e3a7Sitojun * Since the function would cause significant changes in the kernel, DO NOT 773d8a7e3a7Sitojun * make it global, unless you have a strong reason for the change, and are sure 774d8a7e3a7Sitojun * that the change is safe. 775287546eaSitojun */ 776a0aa363cSjsing struct llinfo_nd6 * 777ee37ea65Smcbride nd6_free(struct rtentry *rt, int gc) 778287546eaSitojun { 779cb24f5e5Sclaudio struct rt_addrinfo info; 78029760ae1Sitojun struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo, *next; 781c3c56496Sbluhm struct in6_addr in6 = satosin6(rt_key(rt))->sin6_addr; 782287546eaSitojun struct nd_defrouter *dr; 78381d38878Smpi int s; 784287546eaSitojun 785287546eaSitojun /* 786d8a7e3a7Sitojun * we used to have pfctlinput(PRC_HOSTDEAD) here. 787d8a7e3a7Sitojun * even though it is not harmful, it was not really necessary. 788287546eaSitojun */ 789f4f4d166Sitojun 7906e92dee6Sitojun s = splsoftnet(); 79181d38878Smpi if (!ip6_forwarding) { 792c3c56496Sbluhm dr = defrouter_lookup(&satosin6(rt_key(rt))->sin6_addr, 793f4f4d166Sitojun rt->rt_ifp); 794d8a7e3a7Sitojun 795d8a7e3a7Sitojun if (dr != NULL && dr->expire && 796d8a7e3a7Sitojun ln->ln_state == ND6_LLINFO_STALE && gc) { 797d8a7e3a7Sitojun /* 798d8a7e3a7Sitojun * If the reason for the deletion is just garbage 799d8a7e3a7Sitojun * collection, and the neighbor is an active default 800d8a7e3a7Sitojun * router, do not delete it. Instead, reset the GC 801d8a7e3a7Sitojun * timer using the router's lifetime. 802d8a7e3a7Sitojun * Simply deleting the entry would affect default 803d8a7e3a7Sitojun * router selection, which is not necessarily a good 804d8a7e3a7Sitojun * thing, especially when we're using router preference 805d8a7e3a7Sitojun * values. 806d8a7e3a7Sitojun * XXX: the check for ln_state would be redundant, 807d8a7e3a7Sitojun * but we intentionally keep it just in case. 808d8a7e3a7Sitojun */ 8093212dc31Stholo if (dr->expire > time_second * hz) { 8109631a17bSitojun nd6_llinfo_settimer(ln, 8113212dc31Stholo dr->expire - time_second * hz); 8129631a17bSitojun } else 8139631a17bSitojun nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 814d8a7e3a7Sitojun splx(s); 815d8a7e3a7Sitojun return (ln->ln_next); 816d8a7e3a7Sitojun } 817d8a7e3a7Sitojun 818f4f4d166Sitojun if (ln->ln_router || dr) { 819f4f4d166Sitojun /* 820f4f4d166Sitojun * rt6_flush must be called whether or not the neighbor 821f4f4d166Sitojun * is in the Default Router List. 822f4f4d166Sitojun * See a corresponding comment in nd6_na_input(). 823f4f4d166Sitojun */ 824f4f4d166Sitojun rt6_flush(&in6, rt->rt_ifp); 825f4f4d166Sitojun } 826f4f4d166Sitojun 827f4f4d166Sitojun if (dr) { 828f4f4d166Sitojun /* 8298b542bbeSpascoe * Unreachability of a router might affect the default 830f4f4d166Sitojun * router selection and on-link detection of advertised 831f4f4d166Sitojun * prefixes. 832f4f4d166Sitojun */ 833f4f4d166Sitojun 834f4f4d166Sitojun /* 835f4f4d166Sitojun * Temporarily fake the state to choose a new default 836f4f4d166Sitojun * router and to perform on-link determination of 83734deef1eSitojun * prefixes correctly. 838f4f4d166Sitojun * Below the state will be set correctly, 839f4f4d166Sitojun * or the entry itself will be deleted. 840f4f4d166Sitojun */ 841f4f4d166Sitojun ln->ln_state = ND6_LLINFO_INCOMPLETE; 842f4f4d166Sitojun 843f4f4d166Sitojun /* 844d8a7e3a7Sitojun * Since defrouter_select() does not affect the 845d8a7e3a7Sitojun * on-link determination and MIP6 needs the check 846d8a7e3a7Sitojun * before the default router selection, we perform 847d8a7e3a7Sitojun * the check now. 848f4f4d166Sitojun */ 849f4f4d166Sitojun pfxlist_onlink_check(); 850d8a7e3a7Sitojun 851d8a7e3a7Sitojun /* 852d8a7e3a7Sitojun * refresh default router list 853d8a7e3a7Sitojun */ 854d8a7e3a7Sitojun defrouter_select(); 855287546eaSitojun } 856287546eaSitojun } 857287546eaSitojun 85829760ae1Sitojun /* 85929760ae1Sitojun * Before deleting the entry, remember the next entry as the 86029760ae1Sitojun * return value. We need this because pfxlist_onlink_check() above 86129760ae1Sitojun * might have freed other entries (particularly the old next entry) as 86229760ae1Sitojun * a side effect (XXX). 86329760ae1Sitojun */ 86429760ae1Sitojun next = ln->ln_next; 86529760ae1Sitojun 86629760ae1Sitojun /* 86729760ae1Sitojun * Detach the route from the routing tree and the list of neighbor 86829760ae1Sitojun * caches, and disable the route entry not to be used in already 86929760ae1Sitojun * cached routes. 87029760ae1Sitojun */ 871cb24f5e5Sclaudio bzero(&info, sizeof(info)); 872cb24f5e5Sclaudio info.rti_info[RTAX_DST] = rt_key(rt); 873cb24f5e5Sclaudio info.rti_info[RTAX_NETMASK] = rt_mask(rt); 874ba79ddd5Ssperreault rtrequest1(RTM_DELETE, &info, rt->rt_priority, NULL, 875ba79ddd5Ssperreault rt->rt_ifp->if_rdomain); 87681d38878Smpi splx(s); 87729760ae1Sitojun 8780a2c5741Sitojun return (next); 879287546eaSitojun } 880287546eaSitojun 881287546eaSitojun /* 882287546eaSitojun * Upper-layer reachability hint for Neighbor Unreachability Detection. 883287546eaSitojun * 8848b542bbeSpascoe * XXX cost-effective methods? 885287546eaSitojun */ 886287546eaSitojun void 88760f4930eSmpi nd6_nud_hint(struct rtentry *rt, u_int rtableid) 888287546eaSitojun { 889287546eaSitojun struct llinfo_nd6 *ln; 890287546eaSitojun 89160f4930eSmpi if (rt == NULL) { 892287546eaSitojun return; 893287546eaSitojun } 894287546eaSitojun 895f6e55599Sitojun if ((rt->rt_flags & RTF_GATEWAY) != 0 || 896f6e55599Sitojun (rt->rt_flags & RTF_LLINFO) == 0 || 897f6e55599Sitojun !rt->rt_llinfo || !rt->rt_gateway || 898f6e55599Sitojun rt->rt_gateway->sa_family != AF_LINK) { 899287546eaSitojun /* This is not a host route. */ 900287546eaSitojun return; 901287546eaSitojun } 902287546eaSitojun 903287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 904804d8827Sitojun if (ln->ln_state < ND6_LLINFO_REACHABLE) 905287546eaSitojun return; 906287546eaSitojun 907f6e55599Sitojun /* 908f6e55599Sitojun * if we get upper-layer reachability confirmation many times, 909f6e55599Sitojun * it is possible we have false information. 910f6e55599Sitojun */ 911f6e55599Sitojun ln->ln_byhint++; 912f6e55599Sitojun if (ln->ln_byhint > nd6_maxnudhint) 913f6e55599Sitojun return; 914f6e55599Sitojun 915287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 9169631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 9179631a17bSitojun nd6_llinfo_settimer(ln, 9189631a17bSitojun (long)ND_IFINFO(rt->rt_ifp)->reachable * hz); 9199631a17bSitojun } 920287546eaSitojun } 921287546eaSitojun 922287546eaSitojun void 92325314f7cSmpi nd6_rtrequest(int req, struct rtentry *rt) 924287546eaSitojun { 925287546eaSitojun struct sockaddr *gate = rt->rt_gateway; 926287546eaSitojun struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 927287546eaSitojun struct ifnet *ifp = rt->rt_ifp; 928287546eaSitojun struct ifaddr *ifa; 92970fc31beSrainer struct nd_defrouter *dr; 93070fc31beSrainer 93170fc31beSrainer if (req == RTM_DELETE && (rt->rt_flags & RTF_GATEWAY) && 93270fc31beSrainer (IN6_ARE_ADDR_EQUAL(&(satosin6(rt_key(rt)))->sin6_addr, 93370fc31beSrainer &in6addr_any) && rt_mask(rt) && (rt_mask(rt)->sa_len == 0 || 93470fc31beSrainer IN6_ARE_ADDR_EQUAL(&(satosin6(rt_mask(rt)))->sin6_addr, 93570fc31beSrainer &in6addr_any)))) { 936c3c56496Sbluhm dr = defrouter_lookup(&satosin6(gate)->sin6_addr, ifp); 93770fc31beSrainer if (dr) 93870fc31beSrainer dr->installed = 0; 93970fc31beSrainer } 940287546eaSitojun 941d8a7e3a7Sitojun if ((rt->rt_flags & RTF_GATEWAY) != 0) 942287546eaSitojun return; 943287546eaSitojun 944d8a7e3a7Sitojun if (nd6_need_cache(ifp) == 0 && (rt->rt_flags & RTF_HOST) == 0) { 945d8a7e3a7Sitojun /* 946d8a7e3a7Sitojun * This is probably an interface direct route for a link 947d8a7e3a7Sitojun * which does not need neighbor caches (e.g. fe80::%lo0/64). 948d8a7e3a7Sitojun * We do not need special treatment below for such a route. 949d8a7e3a7Sitojun * Moreover, the RTF_LLINFO flag which would be set below 950d8a7e3a7Sitojun * would annoy the ndp(8) command. 951d8a7e3a7Sitojun */ 952d8a7e3a7Sitojun return; 953d8a7e3a7Sitojun } 954d8a7e3a7Sitojun 955af1344beSbluhm if (req == RTM_RESOLVE && nd6_need_cache(ifp) == 0) { 956d8a7e3a7Sitojun /* 957af1344beSbluhm * For routing daemons like ospf6d we allow neighbor discovery 958af1344beSbluhm * based on the cloning route only. This allows us to sent 959af1344beSbluhm * packets directly into a network without having an address 960af1344beSbluhm * with matching prefix on the interface. If the cloning 961af1344beSbluhm * route is used for an stf interface, we would mistakenly 962af1344beSbluhm * make a neighbor cache for the host route, and would see 963af1344beSbluhm * strange neighbor solicitation for the corresponding 964af1344beSbluhm * destination. In order to avoid confusion, we check if the 965af1344beSbluhm * interface is suitable for neighbor discovery, and stop the 966d8a7e3a7Sitojun * process if not. Additionally, we remove the LLINFO flag 967d8a7e3a7Sitojun * so that ndp(8) will not try to get the neighbor information 968d8a7e3a7Sitojun * of the destination. 969d8a7e3a7Sitojun */ 970d8a7e3a7Sitojun rt->rt_flags &= ~RTF_LLINFO; 971d8a7e3a7Sitojun return; 972d8a7e3a7Sitojun } 973d8a7e3a7Sitojun 974287546eaSitojun switch (req) { 975287546eaSitojun case RTM_ADD: 976287546eaSitojun /* 977287546eaSitojun * There is no backward compatibility :) 978287546eaSitojun * 979287546eaSitojun * if ((rt->rt_flags & RTF_HOST) == 0 && 980287546eaSitojun * SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff) 981287546eaSitojun * rt->rt_flags |= RTF_CLONING; 982287546eaSitojun */ 98348ebf8e1Sitojun if ((rt->rt_flags & RTF_CLONING) || 9845f3e87fcSmpi ((rt->rt_flags & (RTF_LLINFO | RTF_LOCAL)) && !ln)) { 985287546eaSitojun if (ln) 9869631a17bSitojun nd6_llinfo_settimer(ln, 0); 987d8a7e3a7Sitojun if ((rt->rt_flags & RTF_CLONING) != 0) 988287546eaSitojun break; 989287546eaSitojun } 990f4f4d166Sitojun /* 9918b542bbeSpascoe * In IPv4 code, we try to announce new RTF_ANNOUNCE entry here. 992f4f4d166Sitojun * We don't do that here since llinfo is not ready yet. 993f4f4d166Sitojun * 994f4f4d166Sitojun * There are also couple of other things to be discussed: 995f4f4d166Sitojun * - unsolicited NA code needs improvement beforehand 996f4f4d166Sitojun * - RFC2461 says we MAY send multicast unsolicited NA 997f4f4d166Sitojun * (7.2.6 paragraph 4), however, it also says that we 998f4f4d166Sitojun * SHOULD provide a mechanism to prevent multicast NA storm. 999f4f4d166Sitojun * we don't have anything like it right now. 1000841d7adbSitojun * note that the mechanism needs a mutual agreement 1001f4f4d166Sitojun * between proxies, which means that we need to implement 1002841d7adbSitojun * a new protocol, or a new kludge. 1003841d7adbSitojun * - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA. 1004f4f4d166Sitojun * we need to check ip6forwarding before sending it. 1005f4f4d166Sitojun * (or should we allow proxy ND configuration only for 1006f4f4d166Sitojun * routers? there's no mention about proxy ND from hosts) 1007f4f4d166Sitojun */ 1008f4f4d166Sitojun #if 0 1009f4f4d166Sitojun /* XXX it does not work */ 1010287546eaSitojun if (rt->rt_flags & RTF_ANNOUNCE) 1011287546eaSitojun nd6_na_output(ifp, 1012c3c56496Sbluhm &satosin6(rt_key(rt))->sin6_addr, 1013c3c56496Sbluhm &satosin6(rt_key(rt))->sin6_addr, 1014287546eaSitojun ip6_forwarding ? ND_NA_FLAG_ROUTER : 0, 1015f4f4d166Sitojun 1, NULL); 1016f4f4d166Sitojun #endif 1017287546eaSitojun /* FALLTHROUGH */ 1018287546eaSitojun case RTM_RESOLVE: 1019287546eaSitojun if (gate->sa_family != AF_LINK || 1020cfc71c8bSclaudio gate->sa_len < sizeof(struct sockaddr_dl)) { 102186b61919Smpi log(LOG_DEBUG, "%s: bad gateway value: %s\n", 102286b61919Smpi __func__, ifp->if_xname); 1023287546eaSitojun break; 1024287546eaSitojun } 1025287546eaSitojun SDL(gate)->sdl_type = ifp->if_type; 1026287546eaSitojun SDL(gate)->sdl_index = ifp->if_index; 1027d374aaacSitojun if (ln != NULL) 1028287546eaSitojun break; /* This happens on a route change */ 1029287546eaSitojun /* 1030287546eaSitojun * Case 2: This route may come from cloning, or a manual route 1031287546eaSitojun * add with a LL address. 1032287546eaSitojun */ 10337371a15dStedu ln = malloc(sizeof(*ln), M_RTABLE, M_NOWAIT | M_ZERO); 1034287546eaSitojun rt->rt_llinfo = (caddr_t)ln; 1035287546eaSitojun if (!ln) { 103686b61919Smpi log(LOG_DEBUG, "%s: malloc failed\n", __func__); 1037287546eaSitojun break; 1038287546eaSitojun } 1039287546eaSitojun nd6_inuse++; 1040287546eaSitojun nd6_allocated++; 1041287546eaSitojun ln->ln_rt = rt; 10429631a17bSitojun timeout_set(&ln->ln_timer_ch, nd6_llinfo_timer, ln); 1043287546eaSitojun /* this is required for "ndp" command. - shin */ 1044287546eaSitojun if (req == RTM_ADD) { 1045287546eaSitojun /* 1046287546eaSitojun * gate should have some valid AF_LINK entry, 1047287546eaSitojun * and ln->ln_expire should have some lifetime 1048287546eaSitojun * which is specified by ndp command. 1049287546eaSitojun */ 1050287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 1051f6e55599Sitojun ln->ln_byhint = 0; 1052287546eaSitojun } else { 1053287546eaSitojun /* 1054287546eaSitojun * When req == RTM_RESOLVE, rt is created and 1055287546eaSitojun * initialized in rtrequest(), so rt_expire is 0. 1056287546eaSitojun */ 1057287546eaSitojun ln->ln_state = ND6_LLINFO_NOSTATE; 10589631a17bSitojun nd6_llinfo_settimer(ln, 0); 1059287546eaSitojun } 1060287546eaSitojun rt->rt_flags |= RTF_LLINFO; 1061287546eaSitojun ln->ln_next = llinfo_nd6.ln_next; 1062287546eaSitojun llinfo_nd6.ln_next = ln; 1063287546eaSitojun ln->ln_prev = &llinfo_nd6; 1064287546eaSitojun ln->ln_next->ln_prev = ln; 1065287546eaSitojun 1066287546eaSitojun /* 1067f3fcf2f3Smcbride * If we have too many cache entries, initiate immediate 1068f3fcf2f3Smcbride * purging for some "less recently used" entries. Note that 1069f3fcf2f3Smcbride * we cannot directly call nd6_free() here because it would 1070f3fcf2f3Smcbride * cause re-entering rtable related routines triggering an LOR 1071f3fcf2f3Smcbride * problem for FreeBSD. 1072f3fcf2f3Smcbride */ 1073f3fcf2f3Smcbride if (ip6_neighborgcthresh >= 0 && 1074f3fcf2f3Smcbride nd6_inuse >= ip6_neighborgcthresh) { 1075f3fcf2f3Smcbride int i; 1076f3fcf2f3Smcbride 1077f3fcf2f3Smcbride for (i = 0; i < 10 && llinfo_nd6.ln_prev != ln; i++) { 1078f3fcf2f3Smcbride struct llinfo_nd6 *ln_end = llinfo_nd6.ln_prev; 1079f3fcf2f3Smcbride 1080f3fcf2f3Smcbride /* Move this entry to the head */ 1081f3fcf2f3Smcbride LN_DEQUEUE(ln_end); 1082f3fcf2f3Smcbride LN_INSERTHEAD(ln_end); 1083f3fcf2f3Smcbride 1084f3fcf2f3Smcbride if (ND6_LLINFO_PERMANENT(ln_end)) 1085f3fcf2f3Smcbride continue; 1086f3fcf2f3Smcbride 1087f3fcf2f3Smcbride if (ln_end->ln_state > ND6_LLINFO_INCOMPLETE) 1088f3fcf2f3Smcbride ln_end->ln_state = ND6_LLINFO_STALE; 1089f3fcf2f3Smcbride else 1090f3fcf2f3Smcbride ln_end->ln_state = ND6_LLINFO_PURGE; 1091f3fcf2f3Smcbride nd6_llinfo_settimer(ln_end, 0); 1092f3fcf2f3Smcbride } 1093f3fcf2f3Smcbride } 1094f3fcf2f3Smcbride 1095f3fcf2f3Smcbride /* 1096287546eaSitojun * check if rt_key(rt) is one of my address assigned 1097287546eaSitojun * to the interface. 1098287546eaSitojun */ 109986b61919Smpi ifa = &in6ifa_ifpwithaddr(ifp, 1100c3c56496Sbluhm &satosin6(rt_key(rt))->sin6_addr)->ia_ifa; 1101287546eaSitojun if (ifa) { 11029631a17bSitojun nd6_llinfo_settimer(ln, -1); 1103287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 1104f6e55599Sitojun ln->ln_byhint = 0; 11057da1c795Smpi 11067da1c795Smpi /* 11077da1c795Smpi * XXX Since lo0 is in the default rdomain we 11087da1c795Smpi * should not (ab)use it for any route related 11097da1c795Smpi * to an interface of a different rdomain. 11107da1c795Smpi */ 11117da1c795Smpi rt->rt_ifp = lo0ifp; 11124ceb7caaSmpi 1113287546eaSitojun /* 1114287546eaSitojun * Make sure rt_ifa be equal to the ifaddr 1115287546eaSitojun * corresponding to the address. 1116287546eaSitojun * We need this because when we refer 1117287546eaSitojun * rt_ifa->ia6_flags in ip6_input, we assume 1118287546eaSitojun * that the rt_ifa points to the address instead 1119287546eaSitojun * of the loopback address. 1120287546eaSitojun */ 1121287546eaSitojun if (ifa != rt->rt_ifa) { 1122c405c1b9Smpi ifafree(rt->rt_ifa); 1123287546eaSitojun ifa->ifa_refcnt++; 1124287546eaSitojun rt->rt_ifa = ifa; 1125287546eaSitojun } 1126f4f4d166Sitojun } else if (rt->rt_flags & RTF_ANNOUNCE) { 11279631a17bSitojun nd6_llinfo_settimer(ln, -1); 1128f4f4d166Sitojun ln->ln_state = ND6_LLINFO_REACHABLE; 1129f6e55599Sitojun ln->ln_byhint = 0; 1130f4f4d166Sitojun 1131f4f4d166Sitojun /* join solicited node multicast for proxy ND */ 1132f4f4d166Sitojun if (ifp->if_flags & IFF_MULTICAST) { 1133f4f4d166Sitojun struct in6_addr llsol; 1134f4f4d166Sitojun int error; 1135f4f4d166Sitojun 1136c3c56496Sbluhm llsol = satosin6(rt_key(rt))->sin6_addr; 1137f4f4d166Sitojun llsol.s6_addr16[0] = htons(0xff02); 1138f4f4d166Sitojun llsol.s6_addr16[1] = htons(ifp->if_index); 1139f4f4d166Sitojun llsol.s6_addr32[1] = 0; 1140f4f4d166Sitojun llsol.s6_addr32[2] = htonl(1); 1141f4f4d166Sitojun llsol.s6_addr8[12] = 0xff; 1142f4f4d166Sitojun 1143d8a7e3a7Sitojun if (in6_addmulti(&llsol, ifp, &error)) { 1144bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 1145d8a7e3a7Sitojun nd6log((LOG_ERR, "%s: failed to join " 1146d8a7e3a7Sitojun "%s (errno=%d)\n", ifp->if_xname, 1147bbcf0337Smpi inet_ntop(AF_INET6, &llsol, 1148bbcf0337Smpi addr, sizeof(addr)), 1149bbcf0337Smpi error)); 1150d8a7e3a7Sitojun } 1151f4f4d166Sitojun } 1152287546eaSitojun } 1153287546eaSitojun break; 1154287546eaSitojun 1155287546eaSitojun case RTM_DELETE: 1156287546eaSitojun if (!ln) 1157287546eaSitojun break; 1158f4f4d166Sitojun /* leave from solicited node multicast for proxy ND */ 1159f4f4d166Sitojun if ((rt->rt_flags & RTF_ANNOUNCE) != 0 && 1160f4f4d166Sitojun (ifp->if_flags & IFF_MULTICAST) != 0) { 1161f4f4d166Sitojun struct in6_addr llsol; 1162f4f4d166Sitojun struct in6_multi *in6m; 1163f4f4d166Sitojun 1164c3c56496Sbluhm llsol = satosin6(rt_key(rt))->sin6_addr; 1165f4f4d166Sitojun llsol.s6_addr16[0] = htons(0xff02); 1166f4f4d166Sitojun llsol.s6_addr16[1] = htons(ifp->if_index); 1167f4f4d166Sitojun llsol.s6_addr32[1] = 0; 1168f4f4d166Sitojun llsol.s6_addr32[2] = htonl(1); 1169f4f4d166Sitojun llsol.s6_addr8[12] = 0xff; 1170f4f4d166Sitojun 1171f4f4d166Sitojun IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1172f4f4d166Sitojun if (in6m) 1173f4f4d166Sitojun in6_delmulti(in6m); 1174f4f4d166Sitojun } 1175287546eaSitojun nd6_inuse--; 1176287546eaSitojun ln->ln_next->ln_prev = ln->ln_prev; 1177287546eaSitojun ln->ln_prev->ln_next = ln->ln_next; 1178287546eaSitojun ln->ln_prev = NULL; 11799631a17bSitojun nd6_llinfo_settimer(ln, -1); 1180287546eaSitojun rt->rt_llinfo = 0; 1181287546eaSitojun rt->rt_flags &= ~RTF_LLINFO; 1182287546eaSitojun m_freem(ln->ln_hold); 1183dd168dc2Stedu free(ln, M_RTABLE, 0); 1184287546eaSitojun } 1185287546eaSitojun } 1186287546eaSitojun 1187287546eaSitojun int 1188ee37ea65Smcbride nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp) 1189287546eaSitojun { 1190287546eaSitojun struct in6_ndireq *ndi = (struct in6_ndireq *)data; 1191287546eaSitojun struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data; 1192287546eaSitojun struct rtentry *rt; 1193ee3c93eeSbluhm int error = 0; 1194287546eaSitojun int s; 1195287546eaSitojun 1196287546eaSitojun switch (cmd) { 1197d6b9e9b9Sitojun case SIOCGIFINFO_IN6: 1198d6b9e9b9Sitojun ndi->ndi = *ND_IFINFO(ifp); 1199287546eaSitojun break; 1200d374aaacSitojun case SIOCSIFINFO_FLAGS: 1201d6b9e9b9Sitojun ND_IFINFO(ifp)->flags = ndi->ndi.flags; 1202d374aaacSitojun break; 1203f4f4d166Sitojun case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */ 1204d8a7e3a7Sitojun /* sync kernel routing table with the default router list */ 1205d8a7e3a7Sitojun defrouter_reset(); 1206f4f4d166Sitojun defrouter_select(); 1207287546eaSitojun break; 1208287546eaSitojun case SIOCSPFXFLUSH_IN6: 1209287546eaSitojun { 1210287546eaSitojun /* flush all the prefix advertised by routers */ 1211119a433cSbluhm struct nd_prefix *pr, *npr; 1212287546eaSitojun 12136e92dee6Sitojun s = splsoftnet(); 1214db657d52Sbluhm /* First purge the addresses referenced by a prefix. */ 1215119a433cSbluhm LIST_FOREACH_SAFE(pr, &nd_prefix, ndpr_entry, npr) { 1216b9e83c60Sbluhm struct in6_ifaddr *ia6, *ia6_next; 1217d8a7e3a7Sitojun 1218d8a7e3a7Sitojun if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1219d8a7e3a7Sitojun continue; /* XXX */ 1220d8a7e3a7Sitojun 1221d8a7e3a7Sitojun /* do we really have to remove addresses as well? */ 1222b9e83c60Sbluhm TAILQ_FOREACH_SAFE(ia6, &in6_ifaddr, ia_list, ia6_next) { 1223b9e83c60Sbluhm if ((ia6->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1224d8a7e3a7Sitojun continue; 1225d8a7e3a7Sitojun 1226b9e83c60Sbluhm if (ia6->ia6_ndpr == pr) 1227b9e83c60Sbluhm in6_purgeaddr(&ia6->ia_ifa); 1228d8a7e3a7Sitojun } 1229db657d52Sbluhm } 1230db657d52Sbluhm /* 1231db657d52Sbluhm * Purging the addresses might remove the prefix as well. 1232db657d52Sbluhm * So run the loop again to access only prefixes that have 1233db657d52Sbluhm * not been freed already. 1234db657d52Sbluhm */ 1235119a433cSbluhm LIST_FOREACH_SAFE(pr, &nd_prefix, ndpr_entry, npr) { 1236db657d52Sbluhm if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1237db657d52Sbluhm continue; /* XXX */ 1238db657d52Sbluhm 1239287546eaSitojun prelist_remove(pr); 1240287546eaSitojun } 1241287546eaSitojun splx(s); 1242287546eaSitojun break; 1243287546eaSitojun } 1244287546eaSitojun case SIOCSRTRFLUSH_IN6: 1245287546eaSitojun { 1246287546eaSitojun /* flush all the default routers */ 1247568012e6Sbluhm struct nd_defrouter *dr, *ndr; 1248287546eaSitojun 12496e92dee6Sitojun s = splsoftnet(); 1250d8a7e3a7Sitojun defrouter_reset(); 1251568012e6Sbluhm TAILQ_FOREACH_SAFE(dr, &nd_defrouter, dr_entry, ndr) 1252287546eaSitojun defrtrlist_del(dr); 1253d8a7e3a7Sitojun defrouter_select(); 1254287546eaSitojun splx(s); 1255287546eaSitojun break; 1256287546eaSitojun } 1257287546eaSitojun case SIOCGNBRINFO_IN6: 1258287546eaSitojun { 1259287546eaSitojun struct llinfo_nd6 *ln; 1260287546eaSitojun struct in6_addr nb_addr = nbi->addr; /* make local for safety */ 1261287546eaSitojun 1262287546eaSitojun /* 1263287546eaSitojun * XXX: KAME specific hack for scoped addresses 1264287546eaSitojun * XXXX: for other scopes than link-local? 1265287546eaSitojun */ 1266287546eaSitojun if (IN6_IS_ADDR_LINKLOCAL(&nbi->addr) || 1267287546eaSitojun IN6_IS_ADDR_MC_LINKLOCAL(&nbi->addr)) { 1268287546eaSitojun u_int16_t *idp = (u_int16_t *)&nb_addr.s6_addr[2]; 1269287546eaSitojun 1270287546eaSitojun if (*idp == 0) 1271287546eaSitojun *idp = htons(ifp->if_index); 1272287546eaSitojun } 1273287546eaSitojun 12746e92dee6Sitojun s = splsoftnet(); 1275f4d1af37Smikeb if ((rt = nd6_lookup(&nb_addr, 0, ifp, ifp->if_rdomain)) == NULL || 1276d8a7e3a7Sitojun (ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) { 1277287546eaSitojun error = EINVAL; 127891e69634Sitojun splx(s); 1279287546eaSitojun break; 1280287546eaSitojun } 1281287546eaSitojun nbi->state = ln->ln_state; 1282287546eaSitojun nbi->asked = ln->ln_asked; 1283287546eaSitojun nbi->isrouter = ln->ln_router; 1284287546eaSitojun nbi->expire = ln->ln_expire; 1285287546eaSitojun splx(s); 1286287546eaSitojun 1287287546eaSitojun break; 1288287546eaSitojun } 1289287546eaSitojun } 1290287546eaSitojun return (error); 1291287546eaSitojun } 1292287546eaSitojun 1293287546eaSitojun /* 1294287546eaSitojun * Create neighbor cache entry and cache link-layer address, 1295287546eaSitojun * on reception of inbound ND6 packets. (RS/RA/NS/redirect) 1296ee37ea65Smcbride * 1297ee37ea65Smcbride * type - ICMP6 type 1298ee37ea65Smcbride * code - type dependent information 1299287546eaSitojun */ 1300287546eaSitojun struct rtentry * 1301ee37ea65Smcbride nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr, 1302ee37ea65Smcbride int lladdrlen, int type, int code) 1303287546eaSitojun { 1304287546eaSitojun struct rtentry *rt = NULL; 1305287546eaSitojun struct llinfo_nd6 *ln = NULL; 1306287546eaSitojun int is_newentry; 1307287546eaSitojun struct sockaddr_dl *sdl = NULL; 1308287546eaSitojun int do_update; 1309287546eaSitojun int olladdr; 1310287546eaSitojun int llchange; 1311287546eaSitojun int newstate = 0; 1312287546eaSitojun 1313287546eaSitojun if (!ifp) 1314287546eaSitojun panic("ifp == NULL in nd6_cache_lladdr"); 1315287546eaSitojun if (!from) 1316287546eaSitojun panic("from == NULL in nd6_cache_lladdr"); 1317287546eaSitojun 1318287546eaSitojun /* nothing must be updated for unspecified address */ 1319287546eaSitojun if (IN6_IS_ADDR_UNSPECIFIED(from)) 1320287546eaSitojun return NULL; 1321287546eaSitojun 1322287546eaSitojun /* 1323287546eaSitojun * Validation about ifp->if_addrlen and lladdrlen must be done in 1324287546eaSitojun * the caller. 1325287546eaSitojun * 13268b542bbeSpascoe * XXX If the link does not have link-layer address, what should 1327287546eaSitojun * we do? (ifp->if_addrlen == 0) 1328287546eaSitojun * Spec says nothing in sections for RA, RS and NA. There's small 1329287546eaSitojun * description on it in NS section (RFC 2461 7.2.3). 1330287546eaSitojun */ 1331287546eaSitojun 1332f4d1af37Smikeb rt = nd6_lookup(from, 0, ifp, ifp->if_rdomain); 1333287546eaSitojun if (!rt) { 1334287546eaSitojun #if 0 1335287546eaSitojun /* nothing must be done if there's no lladdr */ 1336287546eaSitojun if (!lladdr || !lladdrlen) 1337287546eaSitojun return NULL; 1338287546eaSitojun #endif 1339287546eaSitojun 13405148b194Smpi rt = nd6_lookup(from, 1, ifp, ifp->if_rdomain); 1341287546eaSitojun is_newentry = 1; 13420a2c5741Sitojun } else { 13430a2c5741Sitojun /* do nothing if static ndp is set */ 13440a2c5741Sitojun if (rt->rt_flags & RTF_STATIC) 13450a2c5741Sitojun return NULL; 1346287546eaSitojun is_newentry = 0; 13470a2c5741Sitojun } 1348287546eaSitojun 1349287546eaSitojun if (!rt) 1350287546eaSitojun return NULL; 1351287546eaSitojun if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) { 1352287546eaSitojun fail: 1353d8a7e3a7Sitojun (void)nd6_free(rt, 0); 1354287546eaSitojun return NULL; 1355287546eaSitojun } 1356287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1357287546eaSitojun if (!ln) 1358287546eaSitojun goto fail; 1359287546eaSitojun if (!rt->rt_gateway) 1360287546eaSitojun goto fail; 1361287546eaSitojun if (rt->rt_gateway->sa_family != AF_LINK) 1362287546eaSitojun goto fail; 1363287546eaSitojun sdl = SDL(rt->rt_gateway); 1364287546eaSitojun 1365287546eaSitojun olladdr = (sdl->sdl_alen) ? 1 : 0; 1366287546eaSitojun if (olladdr && lladdr) { 1367287546eaSitojun if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 1368287546eaSitojun llchange = 1; 1369287546eaSitojun else 1370287546eaSitojun llchange = 0; 1371287546eaSitojun } else 1372287546eaSitojun llchange = 0; 1373287546eaSitojun 1374287546eaSitojun /* 1375287546eaSitojun * newentry olladdr lladdr llchange (*=record) 1376287546eaSitojun * 0 n n -- (1) 1377287546eaSitojun * 0 y n -- (2) 1378287546eaSitojun * 0 n y -- (3) * STALE 1379287546eaSitojun * 0 y y n (4) * 1380287546eaSitojun * 0 y y y (5) * STALE 1381287546eaSitojun * 1 -- n -- (6) NOSTATE(= PASSIVE) 1382287546eaSitojun * 1 -- y -- (7) * STALE 1383287546eaSitojun */ 1384287546eaSitojun 1385c8a7c9e3Sbluhm if (llchange) { 1386bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 1387c8a7c9e3Sbluhm log(LOG_INFO, "ndp info overwritten for %s by %s on %s\n", 1388bbcf0337Smpi inet_ntop(AF_INET6, from, addr, sizeof(addr)), 1389bbcf0337Smpi ether_sprintf(lladdr), ifp->if_xname); 1390c8a7c9e3Sbluhm } 1391287546eaSitojun if (lladdr) { /* (3-5) and (7) */ 1392287546eaSitojun /* 1393287546eaSitojun * Record source link-layer address 1394287546eaSitojun * XXX is it dependent to ifp->if_type? 1395287546eaSitojun */ 1396287546eaSitojun sdl->sdl_alen = ifp->if_addrlen; 1397287546eaSitojun bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 1398287546eaSitojun } 1399287546eaSitojun 1400287546eaSitojun if (!is_newentry) { 1401d8a7e3a7Sitojun if ((!olladdr && lladdr) || /* (3) */ 1402d8a7e3a7Sitojun (olladdr && lladdr && llchange)) { /* (5) */ 1403287546eaSitojun do_update = 1; 1404287546eaSitojun newstate = ND6_LLINFO_STALE; 1405287546eaSitojun } else /* (1-2,4) */ 1406287546eaSitojun do_update = 0; 1407287546eaSitojun } else { 1408287546eaSitojun do_update = 1; 1409287546eaSitojun if (!lladdr) /* (6) */ 1410287546eaSitojun newstate = ND6_LLINFO_NOSTATE; 1411287546eaSitojun else /* (7) */ 1412287546eaSitojun newstate = ND6_LLINFO_STALE; 1413287546eaSitojun } 1414287546eaSitojun 1415287546eaSitojun if (do_update) { 1416287546eaSitojun /* 1417287546eaSitojun * Update the state of the neighbor cache. 1418287546eaSitojun */ 1419287546eaSitojun ln->ln_state = newstate; 1420287546eaSitojun 1421287546eaSitojun if (ln->ln_state == ND6_LLINFO_STALE) { 14228a7bb304Sitojun /* 14238a7bb304Sitojun * XXX: since nd6_output() below will cause 14248b542bbeSpascoe * state transition to DELAY and reset the timer, 14258a7bb304Sitojun * we must set the timer now, although it is actually 14268a7bb304Sitojun * meaningless. 14278a7bb304Sitojun */ 14289631a17bSitojun nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 14298a7bb304Sitojun 1430287546eaSitojun if (ln->ln_hold) { 1431e212adedSkrw struct mbuf *n = ln->ln_hold; 1432e212adedSkrw ln->ln_hold = NULL; 14336afad192Sitojun /* 14346afad192Sitojun * we assume ifp is not a p2p here, so just 14356afad192Sitojun * set the 2nd argument as the 1st one. 14366afad192Sitojun */ 1437bc3c7896Smpi nd6_output(ifp, n, satosin6(rt_key(rt)), rt); 1438e212adedSkrw if (ln->ln_hold == n) { 1439e212adedSkrw /* n is back in ln_hold. Discard. */ 1440e212adedSkrw m_freem(ln->ln_hold); 14418a7bb304Sitojun ln->ln_hold = NULL; 1442287546eaSitojun } 1443e212adedSkrw } 1444287546eaSitojun } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 1445287546eaSitojun /* probe right away */ 14469631a17bSitojun nd6_llinfo_settimer((void *)ln, 0); 1447287546eaSitojun } 1448287546eaSitojun } 1449287546eaSitojun 1450287546eaSitojun /* 1451287546eaSitojun * ICMP6 type dependent behavior. 1452287546eaSitojun * 1453287546eaSitojun * NS: clear IsRouter if new entry 1454287546eaSitojun * RS: clear IsRouter 1455287546eaSitojun * RA: set IsRouter if there's lladdr 1456287546eaSitojun * redir: clear IsRouter if new entry 1457287546eaSitojun * 1458287546eaSitojun * RA case, (1): 1459287546eaSitojun * The spec says that we must set IsRouter in the following cases: 1460287546eaSitojun * - If lladdr exist, set IsRouter. This means (1-5). 1461287546eaSitojun * - If it is old entry (!newentry), set IsRouter. This means (7). 1462287546eaSitojun * So, based on the spec, in (1-5) and (7) cases we must set IsRouter. 14638b542bbeSpascoe * A question arises for (1) case. (1) case has no lladdr in the 1464287546eaSitojun * neighbor cache, this is similar to (6). 1465287546eaSitojun * This case is rare but we figured that we MUST NOT set IsRouter. 1466287546eaSitojun * 1467287546eaSitojun * newentry olladdr lladdr llchange NS RS RA redir 1468287546eaSitojun * D R 1469287546eaSitojun * 0 n n -- (1) c ? s 1470287546eaSitojun * 0 y n -- (2) c s s 1471287546eaSitojun * 0 n y -- (3) c s s 1472287546eaSitojun * 0 y y n (4) c s s 1473287546eaSitojun * 0 y y y (5) c s s 1474287546eaSitojun * 1 -- n -- (6) c c c s 1475287546eaSitojun * 1 -- y -- (7) c c s c s 1476287546eaSitojun * 1477287546eaSitojun * (c=clear s=set) 1478287546eaSitojun */ 1479287546eaSitojun switch (type & 0xff) { 1480287546eaSitojun case ND_NEIGHBOR_SOLICIT: 1481287546eaSitojun /* 1482287546eaSitojun * New entry must have is_router flag cleared. 1483287546eaSitojun */ 1484287546eaSitojun if (is_newentry) /* (6-7) */ 1485287546eaSitojun ln->ln_router = 0; 1486287546eaSitojun break; 1487287546eaSitojun case ND_REDIRECT: 1488287546eaSitojun /* 1489287546eaSitojun * If the icmp is a redirect to a better router, always set the 1490287546eaSitojun * is_router flag. Otherwise, if the entry is newly created, 1491287546eaSitojun * clear the flag. [RFC 2461, sec 8.3] 1492287546eaSitojun */ 1493287546eaSitojun if (code == ND_REDIRECT_ROUTER) 1494287546eaSitojun ln->ln_router = 1; 1495287546eaSitojun else if (is_newentry) /* (6-7) */ 1496287546eaSitojun ln->ln_router = 0; 1497287546eaSitojun break; 1498287546eaSitojun case ND_ROUTER_SOLICIT: 1499287546eaSitojun /* 1500287546eaSitojun * is_router flag must always be cleared. 1501287546eaSitojun */ 1502287546eaSitojun ln->ln_router = 0; 1503287546eaSitojun break; 1504287546eaSitojun case ND_ROUTER_ADVERT: 1505287546eaSitojun /* 1506287546eaSitojun * Mark an entry with lladdr as a router. 1507287546eaSitojun */ 1508d8a7e3a7Sitojun if ((!is_newentry && (olladdr || lladdr)) || /* (2-5) */ 1509d8a7e3a7Sitojun (is_newentry && lladdr)) { /* (7) */ 1510287546eaSitojun ln->ln_router = 1; 1511287546eaSitojun } 1512287546eaSitojun break; 1513287546eaSitojun } 1514287546eaSitojun 151550ccc024Sitojun /* 151650ccc024Sitojun * When the link-layer address of a router changes, select the 151750ccc024Sitojun * best router again. In particular, when the neighbor entry is newly 151850ccc024Sitojun * created, it might affect the selection policy. 151950ccc024Sitojun * Question: can we restrict the first condition to the "is_newentry" 152050ccc024Sitojun * case? 152150ccc024Sitojun * XXX: when we hear an RA from a new router with the link-layer 152250ccc024Sitojun * address option, defrouter_select() is called twice, since 152350ccc024Sitojun * defrtrlist_update called the function as well. However, I believe 152450ccc024Sitojun * we can compromise the overhead, since it only happens the first 152550ccc024Sitojun * time. 152650ccc024Sitojun */ 1527d3b1c214Sflorian if (do_update && ln->ln_router && (ifp->if_xflags & IFXF_AUTOCONF6)) 152850ccc024Sitojun defrouter_select(); 152950ccc024Sitojun 1530287546eaSitojun return rt; 1531287546eaSitojun } 1532287546eaSitojun 1533a0aa363cSjsing void 1534ee37ea65Smcbride nd6_slowtimo(void *ignored_arg) 1535287546eaSitojun { 15366e92dee6Sitojun int s = splsoftnet(); 1537b3c1e4c1Sitojun struct nd_ifinfo *nd6if; 1538d6b9e9b9Sitojun struct ifnet *ifp; 1539287546eaSitojun 1540b3c1e4c1Sitojun timeout_set(&nd6_slowtimo_ch, nd6_slowtimo, NULL); 154129e86e5eSblambert timeout_add_sec(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL); 1542d814b14cSbluhm TAILQ_FOREACH(ifp, &ifnet, if_list) { 1543d6b9e9b9Sitojun nd6if = ND_IFINFO(ifp); 1544287546eaSitojun if (nd6if->basereachable && /* already initialized */ 1545287546eaSitojun (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) { 1546287546eaSitojun /* 1547287546eaSitojun * Since reachable time rarely changes by router 1548287546eaSitojun * advertisements, we SHOULD insure that a new random 1549287546eaSitojun * value gets recomputed at least once every few hours. 1550287546eaSitojun * (RFC 2461, 6.3.4) 1551287546eaSitojun */ 1552287546eaSitojun nd6if->recalctm = nd6_recalc_reachtm_interval; 1553287546eaSitojun nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable); 1554287546eaSitojun } 1555287546eaSitojun } 1556287546eaSitojun splx(s); 1557287546eaSitojun } 1558287546eaSitojun 1559287546eaSitojun #define senderr(e) { error = (e); goto bad;} 1560287546eaSitojun int 1561bc3c7896Smpi nd6_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr_in6 *dst, 1562bc3c7896Smpi struct rtentry *rt0) 1563287546eaSitojun { 1564b3c1e4c1Sitojun struct mbuf *m = m0; 1565b3c1e4c1Sitojun struct rtentry *rt = rt0; 1566287546eaSitojun struct llinfo_nd6 *ln = NULL; 1567287546eaSitojun int error = 0; 1568287546eaSitojun 1569287546eaSitojun if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr)) 1570287546eaSitojun goto sendpkt; 1571287546eaSitojun 1572d8a7e3a7Sitojun if (nd6_need_cache(ifp) == 0) 1573287546eaSitojun goto sendpkt; 1574287546eaSitojun 1575287546eaSitojun /* 15768c023157Smpi * next hop determination. 1577287546eaSitojun */ 15788c023157Smpi if (rt0 != NULL) { 15798c023157Smpi error = rt_checkgate(ifp, rt0, sin6tosa(dst), 15808c023157Smpi m->m_pkthdr.ph_rtableid, &rt); 15818c023157Smpi if (error) { 15828c023157Smpi m_freem(m); 15838c023157Smpi return (error); 1584287546eaSitojun } 1585cfb6b8dfSitojun 1586cfb6b8dfSitojun /* 1587cfb6b8dfSitojun * We skip link-layer address resolution and NUD 1588cfb6b8dfSitojun * if the gateway is not a neighbor from ND point 1589d8a7e3a7Sitojun * of view, regardless of the value of nd_ifinfo.flags. 159034deef1eSitojun * The second condition is a bit tricky; we skip 1591cfb6b8dfSitojun * if the gateway is our own address, which is 1592cfb6b8dfSitojun * sometimes used to install a route to a p2p link. 1593cfb6b8dfSitojun */ 15948c023157Smpi if ((ifp->if_flags & IFF_POINTOPOINT) && 15958c023157Smpi ((nd6_is_addr_neighbor(satosin6(rt_key(rt)), ifp) == 0) || 15968c023157Smpi in6ifa_ifpwithaddr(ifp, &satosin6(rt_key(rt))->sin6_addr))) 1597cfb6b8dfSitojun goto sendpkt; 1598cfb6b8dfSitojun } 1599cfb6b8dfSitojun 1600287546eaSitojun /* 1601287546eaSitojun * Address resolution or Neighbor Unreachability Detection 1602287546eaSitojun * for the next hop. 1603287546eaSitojun * At this point, the destination of the packet must be a unicast 1604287546eaSitojun * or an anycast address(i.e. not a multicast). 1605287546eaSitojun */ 1606287546eaSitojun 1607287546eaSitojun /* Look up the neighbor cache for the nexthop */ 1608287546eaSitojun if (rt && (rt->rt_flags & RTF_LLINFO) != 0) 1609287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1610287546eaSitojun else { 1611cfb6b8dfSitojun /* 1612cfb6b8dfSitojun * Since nd6_is_addr_neighbor() internally calls nd6_lookup(), 1613cfb6b8dfSitojun * the condition below is not very efficient. But we believe 1614cfb6b8dfSitojun * it is tolerable, because this should be a rare case. 1615cfb6b8dfSitojun */ 1616cfb6b8dfSitojun if (nd6_is_addr_neighbor(dst, ifp) && 16175148b194Smpi (rt = nd6_lookup(&dst->sin6_addr, 1, ifp, 1618f4d1af37Smikeb ifp->if_rdomain)) != NULL) 1619287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1620287546eaSitojun } 1621287546eaSitojun if (!ln || !rt) { 1622cfb6b8dfSitojun if ((ifp->if_flags & IFF_POINTOPOINT) == 0 && 1623d6b9e9b9Sitojun !(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) { 1624bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 1625bbcf0337Smpi 1626*35075f95Smpi log(LOG_DEBUG, "%s: can't allocate llinfo for %s " 1627*35075f95Smpi "(ln=%p, rt=%p)\n", __func__, 1628bbcf0337Smpi inet_ntop(AF_INET6, &dst->sin6_addr, 1629bbcf0337Smpi addr, sizeof(addr)), 1630bbcf0337Smpi ln, rt); 1631287546eaSitojun senderr(EIO); /* XXX: good error? */ 1632287546eaSitojun } 1633287546eaSitojun 1634cfb6b8dfSitojun goto sendpkt; /* send anyway */ 1635cfb6b8dfSitojun } 1636cfb6b8dfSitojun 1637f3fcf2f3Smcbride /* 1638f3fcf2f3Smcbride * Move this entry to the head of the queue so that it is less likely 1639f3fcf2f3Smcbride * for this entry to be a target of forced garbage collection (see 1640f3fcf2f3Smcbride * nd6_rtrequest()). 1641f3fcf2f3Smcbride */ 1642f3fcf2f3Smcbride LN_DEQUEUE(ln); 1643f3fcf2f3Smcbride LN_INSERTHEAD(ln); 1644f3fcf2f3Smcbride 1645d374aaacSitojun /* We don't have to do link-layer address resolution on a p2p link. */ 1646d374aaacSitojun if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1647be4e9e12Sitojun ln->ln_state < ND6_LLINFO_REACHABLE) { 1648d374aaacSitojun ln->ln_state = ND6_LLINFO_STALE; 16499631a17bSitojun nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 1650be4e9e12Sitojun } 1651287546eaSitojun 1652287546eaSitojun /* 1653287546eaSitojun * The first time we send a packet to a neighbor whose entry is 1654287546eaSitojun * STALE, we have to change the state to DELAY and a sets a timer to 1655287546eaSitojun * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do 1656287546eaSitojun * neighbor unreachability detection on expiration. 1657287546eaSitojun * (RFC 2461 7.3.3) 1658287546eaSitojun */ 1659287546eaSitojun if (ln->ln_state == ND6_LLINFO_STALE) { 1660287546eaSitojun ln->ln_asked = 0; 1661287546eaSitojun ln->ln_state = ND6_LLINFO_DELAY; 16629631a17bSitojun nd6_llinfo_settimer(ln, nd6_delay * hz); 1663287546eaSitojun } 1664287546eaSitojun 1665287546eaSitojun /* 1666287546eaSitojun * If the neighbor cache entry has a state other than INCOMPLETE 166734deef1eSitojun * (i.e. its link-layer address is already resolved), just 1668287546eaSitojun * send the packet. 1669287546eaSitojun */ 1670287546eaSitojun if (ln->ln_state > ND6_LLINFO_INCOMPLETE) 1671287546eaSitojun goto sendpkt; 1672287546eaSitojun 1673287546eaSitojun /* 1674287546eaSitojun * There is a neighbor cache entry, but no ethernet address 1675287546eaSitojun * response yet. Replace the held mbuf (if any) with this 1676287546eaSitojun * latest one. 1677287546eaSitojun */ 1678efcf292bSitojun if (ln->ln_state == ND6_LLINFO_NOSTATE) 1679287546eaSitojun ln->ln_state = ND6_LLINFO_INCOMPLETE; 1680287546eaSitojun m_freem(ln->ln_hold); 1681287546eaSitojun ln->ln_hold = m; 168276843262Sitojun /* 168376843262Sitojun * If there has been no NS for the neighbor after entering the 168476843262Sitojun * INCOMPLETE state, send the first solicitation. 168576843262Sitojun */ 16869631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln) && ln->ln_asked == 0) { 1687287546eaSitojun ln->ln_asked++; 16889631a17bSitojun nd6_llinfo_settimer(ln, 16899631a17bSitojun (long)ND_IFINFO(ifp)->retrans * hz / 1000); 1690287546eaSitojun nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0); 1691287546eaSitojun } 1692287546eaSitojun return (0); 1693287546eaSitojun 1694287546eaSitojun sendpkt: 1695c3c56496Sbluhm return ((*ifp->if_output)(ifp, m, sin6tosa(dst), rt)); 1696287546eaSitojun 1697287546eaSitojun bad: 1698287546eaSitojun m_freem(m); 1699287546eaSitojun return (error); 1700287546eaSitojun } 1701287546eaSitojun #undef senderr 1702287546eaSitojun 1703287546eaSitojun int 1704ee37ea65Smcbride nd6_need_cache(struct ifnet *ifp) 1705d8a7e3a7Sitojun { 1706d8a7e3a7Sitojun /* 1707d8a7e3a7Sitojun * RFC2893 says: 1708d8a7e3a7Sitojun * - unidirectional tunnels needs no ND 1709d8a7e3a7Sitojun */ 1710d8a7e3a7Sitojun switch (ifp->if_type) { 1711d8a7e3a7Sitojun case IFT_ETHER: 1712d8a7e3a7Sitojun case IFT_IEEE1394: 1713d8a7e3a7Sitojun case IFT_PROPVIRTUAL: 1714d8a7e3a7Sitojun case IFT_IEEE80211: 1715f4433d56Shenning case IFT_CARP: 1716d8a7e3a7Sitojun case IFT_GIF: /* XXX need more cases? */ 1717d8a7e3a7Sitojun return (1); 1718d8a7e3a7Sitojun default: 1719d8a7e3a7Sitojun return (0); 1720d8a7e3a7Sitojun } 1721d8a7e3a7Sitojun } 1722d8a7e3a7Sitojun 1723d8a7e3a7Sitojun int 17248c023157Smpi nd6_storelladdr(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m, 1725ee37ea65Smcbride struct sockaddr *dst, u_char *desten) 1726287546eaSitojun { 1727287546eaSitojun struct sockaddr_dl *sdl; 17288c023157Smpi struct rtentry *rt; 17298c023157Smpi int error; 1730287546eaSitojun 1731287546eaSitojun if (m->m_flags & M_MCAST) { 1732287546eaSitojun switch (ifp->if_type) { 1733287546eaSitojun case IFT_ETHER: 173465d1c24fSmpi case IFT_CARP: 1735c3c56496Sbluhm ETHER_MAP_IPV6_MULTICAST(&satosin6(dst)->sin6_addr, 1736287546eaSitojun desten); 17378c023157Smpi return (0); 1738287546eaSitojun break; 1739287546eaSitojun default: 17400a2c5741Sitojun m_freem(m); 17418c023157Smpi return (EINVAL); 1742287546eaSitojun } 1743287546eaSitojun } 1744287546eaSitojun 17458c023157Smpi if (rt0 == NULL) { 174672e30262Sitojun /* this could happen, if we could not allocate memory */ 17470a2c5741Sitojun m_freem(m); 17488c023157Smpi return (ENOMEM); 174972e30262Sitojun } 17508c023157Smpi 17518c023157Smpi error = rt_checkgate(ifp, rt0, dst, m->m_pkthdr.ph_rtableid, &rt); 17528c023157Smpi if (error) { 17538c023157Smpi m_freem(m); 17548c023157Smpi return (error); 17558c023157Smpi } 17568c023157Smpi 175772e30262Sitojun if (rt->rt_gateway->sa_family != AF_LINK) { 1758*35075f95Smpi printf("%s: something odd happens\n", __func__); 17590a2c5741Sitojun m_freem(m); 17608c023157Smpi return (EINVAL); 1761287546eaSitojun } 1762287546eaSitojun sdl = SDL(rt->rt_gateway); 1763dbae7f73Smpi if (sdl->sdl_alen != ETHER_ADDR_LEN) { 1764bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 1765dbae7f73Smpi log(LOG_DEBUG, "%s: %s: incorrect nd6 information\n", __func__, 1766bbcf0337Smpi inet_ntop(AF_INET6, &satosin6(dst)->sin6_addr, 1767dbae7f73Smpi addr, sizeof(addr))); 17680a2c5741Sitojun m_freem(m); 17698c023157Smpi return (EINVAL); 1770b4ee66fcSitojun } 1771287546eaSitojun 1772b4ee66fcSitojun bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 17738c023157Smpi return (0); 1774287546eaSitojun } 1775d8a7e3a7Sitojun 1776ee37ea65Smcbride /* 1777ee37ea65Smcbride * oldp - syscall arg, need copyout 1778ee37ea65Smcbride * newp - syscall arg, need copyin 1779ee37ea65Smcbride */ 1780ee37ea65Smcbride 1781d8a7e3a7Sitojun int 1782a0aa363cSjsing nd6_sysctl(int name, void *oldp, size_t *oldlenp, void *newp, size_t newlen) 1783d8a7e3a7Sitojun { 1784db3db419Sitojun void *p; 178534223ca4Schl size_t ol; 1786d8a7e3a7Sitojun int error; 1787d8a7e3a7Sitojun 1788d8a7e3a7Sitojun error = 0; 1789d8a7e3a7Sitojun 1790d8a7e3a7Sitojun if (newp) 1791d8a7e3a7Sitojun return EPERM; 1792d8a7e3a7Sitojun if (oldp && !oldlenp) 1793d8a7e3a7Sitojun return EINVAL; 1794d8a7e3a7Sitojun ol = oldlenp ? *oldlenp : 0; 1795d8a7e3a7Sitojun 1796db3db419Sitojun if (oldp) { 1797e6ca3d0dSmk p = malloc(*oldlenp, M_TEMP, M_WAITOK | M_CANFAIL); 1798db3db419Sitojun if (!p) 1799db3db419Sitojun return ENOMEM; 1800db3db419Sitojun } else 1801db3db419Sitojun p = NULL; 1802d8a7e3a7Sitojun switch (name) { 1803d8a7e3a7Sitojun case ICMPV6CTL_ND6_DRLIST: 1804db3db419Sitojun error = fill_drlist(p, oldlenp, ol); 1805db3db419Sitojun if (!error && p && oldp) 1806732568ffSitojun error = copyout(p, oldp, *oldlenp); 1807d8a7e3a7Sitojun break; 1808d8a7e3a7Sitojun 1809d8a7e3a7Sitojun case ICMPV6CTL_ND6_PRLIST: 1810db3db419Sitojun error = fill_prlist(p, oldlenp, ol); 1811db3db419Sitojun if (!error && p && oldp) 1812732568ffSitojun error = copyout(p, oldp, *oldlenp); 1813d8a7e3a7Sitojun break; 1814d8a7e3a7Sitojun 1815d8a7e3a7Sitojun default: 1816d8a7e3a7Sitojun error = ENOPROTOOPT; 1817d8a7e3a7Sitojun break; 1818d8a7e3a7Sitojun } 1819db3db419Sitojun if (p) 1820dd168dc2Stedu free(p, M_TEMP, 0); 1821d8a7e3a7Sitojun 1822d8a7e3a7Sitojun return (error); 1823d8a7e3a7Sitojun } 1824d8a7e3a7Sitojun 1825a0aa363cSjsing int 1826ee37ea65Smcbride fill_drlist(void *oldp, size_t *oldlenp, size_t ol) 1827d8a7e3a7Sitojun { 1828d8a7e3a7Sitojun int error = 0, s; 1829d8a7e3a7Sitojun struct in6_defrouter *d = NULL, *de = NULL; 1830d8a7e3a7Sitojun struct nd_defrouter *dr; 1831d8a7e3a7Sitojun size_t l; 1832d8a7e3a7Sitojun 18336e92dee6Sitojun s = splsoftnet(); 1834d8a7e3a7Sitojun 1835d8a7e3a7Sitojun if (oldp) { 1836d8a7e3a7Sitojun d = (struct in6_defrouter *)oldp; 1837d8a7e3a7Sitojun de = (struct in6_defrouter *)((caddr_t)oldp + *oldlenp); 1838d8a7e3a7Sitojun } 1839d8a7e3a7Sitojun l = 0; 1840d8a7e3a7Sitojun 1841568012e6Sbluhm TAILQ_FOREACH(dr, &nd_defrouter, dr_entry) { 1842d8a7e3a7Sitojun if (oldp && d + 1 <= de) { 1843d8a7e3a7Sitojun bzero(d, sizeof(*d)); 1844d8a7e3a7Sitojun d->rtaddr.sin6_family = AF_INET6; 1845d8a7e3a7Sitojun d->rtaddr.sin6_len = sizeof(struct sockaddr_in6); 1846d8a7e3a7Sitojun d->rtaddr.sin6_addr = dr->rtaddr; 1847d8a7e3a7Sitojun in6_recoverscope(&d->rtaddr, &d->rtaddr.sin6_addr, 1848d8a7e3a7Sitojun dr->ifp); 1849d8a7e3a7Sitojun d->flags = dr->flags; 1850d8a7e3a7Sitojun d->rtlifetime = dr->rtlifetime; 1851d8a7e3a7Sitojun d->expire = dr->expire; 1852d8a7e3a7Sitojun d->if_index = dr->ifp->if_index; 1853d8a7e3a7Sitojun } 1854d8a7e3a7Sitojun 1855d8a7e3a7Sitojun l += sizeof(*d); 1856d8a7e3a7Sitojun if (d) 1857d8a7e3a7Sitojun d++; 1858d8a7e3a7Sitojun } 1859d8a7e3a7Sitojun 1860d8a7e3a7Sitojun if (oldp) { 1861d8a7e3a7Sitojun *oldlenp = l; /* (caddr_t)d - (caddr_t)oldp */ 1862d8a7e3a7Sitojun if (l > ol) 1863d8a7e3a7Sitojun error = ENOMEM; 1864d8a7e3a7Sitojun } else 1865d8a7e3a7Sitojun *oldlenp = l; 1866d8a7e3a7Sitojun 1867d8a7e3a7Sitojun splx(s); 1868d8a7e3a7Sitojun 1869d8a7e3a7Sitojun return (error); 1870d8a7e3a7Sitojun } 1871d8a7e3a7Sitojun 1872a0aa363cSjsing int 1873ee37ea65Smcbride fill_prlist(void *oldp, size_t *oldlenp, size_t ol) 1874d8a7e3a7Sitojun { 1875d8a7e3a7Sitojun int error = 0, s; 1876d8a7e3a7Sitojun struct nd_prefix *pr; 1877d8a7e3a7Sitojun struct in6_prefix *p = NULL; 1878d8a7e3a7Sitojun struct in6_prefix *pe = NULL; 1879d8a7e3a7Sitojun size_t l; 1880d8a7e3a7Sitojun 18816e92dee6Sitojun s = splsoftnet(); 1882d8a7e3a7Sitojun 1883d8a7e3a7Sitojun if (oldp) { 1884d8a7e3a7Sitojun p = (struct in6_prefix *)oldp; 1885d8a7e3a7Sitojun pe = (struct in6_prefix *)((caddr_t)oldp + *oldlenp); 1886d8a7e3a7Sitojun } 1887d8a7e3a7Sitojun l = 0; 1888d8a7e3a7Sitojun 1889545205eaSpyr LIST_FOREACH(pr, &nd_prefix, ndpr_entry) { 1890d8a7e3a7Sitojun u_short advrtrs; 1891d8a7e3a7Sitojun size_t advance; 1892d8a7e3a7Sitojun struct sockaddr_in6 *sin6; 1893d8a7e3a7Sitojun struct sockaddr_in6 *s6; 1894d8a7e3a7Sitojun struct nd_pfxrouter *pfr; 1895bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 1896d8a7e3a7Sitojun 1897d8a7e3a7Sitojun if (oldp && p + 1 <= pe) 1898d8a7e3a7Sitojun { 1899d8a7e3a7Sitojun bzero(p, sizeof(*p)); 1900d8a7e3a7Sitojun sin6 = (struct sockaddr_in6 *)(p + 1); 1901d8a7e3a7Sitojun 1902d8a7e3a7Sitojun p->prefix = pr->ndpr_prefix; 1903d8a7e3a7Sitojun if (in6_recoverscope(&p->prefix, 1904d8a7e3a7Sitojun &p->prefix.sin6_addr, pr->ndpr_ifp) != 0) 1905d8a7e3a7Sitojun log(LOG_ERR, 1906d8a7e3a7Sitojun "scope error in prefix list (%s)\n", 1907bbcf0337Smpi inet_ntop(AF_INET6, &p->prefix.sin6_addr, 1908bbcf0337Smpi addr, sizeof(addr))); 1909d8a7e3a7Sitojun p->raflags = pr->ndpr_raf; 1910d8a7e3a7Sitojun p->prefixlen = pr->ndpr_plen; 1911d8a7e3a7Sitojun p->vltime = pr->ndpr_vltime; 1912d8a7e3a7Sitojun p->pltime = pr->ndpr_pltime; 1913d8a7e3a7Sitojun p->if_index = pr->ndpr_ifp->if_index; 1914d8a7e3a7Sitojun if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME) 1915d8a7e3a7Sitojun p->expire = 0; 1916d8a7e3a7Sitojun else { 1917d8a7e3a7Sitojun time_t maxexpire; 1918d8a7e3a7Sitojun 1919d8a7e3a7Sitojun /* XXX: we assume time_t is signed. */ 192091a535ffSguenther maxexpire = (time_t)~(1ULL << 192191a535ffSguenther ((sizeof(maxexpire) * 8) - 1)); 1922d8a7e3a7Sitojun if (pr->ndpr_vltime < 1923d8a7e3a7Sitojun maxexpire - pr->ndpr_lastupdate) { 1924d8a7e3a7Sitojun p->expire = pr->ndpr_lastupdate + 1925d8a7e3a7Sitojun pr->ndpr_vltime; 1926d8a7e3a7Sitojun } else 1927d8a7e3a7Sitojun p->expire = maxexpire; 1928d8a7e3a7Sitojun } 1929d8a7e3a7Sitojun p->refcnt = pr->ndpr_refcnt; 1930d8a7e3a7Sitojun p->flags = pr->ndpr_stateflags; 1931d8a7e3a7Sitojun p->origin = PR_ORIG_RA; 1932d8a7e3a7Sitojun advrtrs = 0; 1933545205eaSpyr LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) { 1934d8a7e3a7Sitojun if ((void *)&sin6[advrtrs + 1] > (void *)pe) { 1935d8a7e3a7Sitojun advrtrs++; 1936d8a7e3a7Sitojun continue; 1937d8a7e3a7Sitojun } 1938d8a7e3a7Sitojun s6 = &sin6[advrtrs]; 1939d8a7e3a7Sitojun s6->sin6_family = AF_INET6; 1940d8a7e3a7Sitojun s6->sin6_len = sizeof(struct sockaddr_in6); 1941d8a7e3a7Sitojun s6->sin6_addr = pfr->router->rtaddr; 1942d8a7e3a7Sitojun in6_recoverscope(s6, &pfr->router->rtaddr, 1943d8a7e3a7Sitojun pfr->router->ifp); 1944d8a7e3a7Sitojun advrtrs++; 1945d8a7e3a7Sitojun } 1946d8a7e3a7Sitojun p->advrtrs = advrtrs; 1947d8a7e3a7Sitojun } 1948d8a7e3a7Sitojun else { 1949d8a7e3a7Sitojun advrtrs = 0; 1950545205eaSpyr LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) 1951d8a7e3a7Sitojun advrtrs++; 1952d8a7e3a7Sitojun } 1953d8a7e3a7Sitojun 1954d8a7e3a7Sitojun advance = sizeof(*p) + sizeof(*sin6) * advrtrs; 1955d8a7e3a7Sitojun l += advance; 1956d8a7e3a7Sitojun if (p) 1957d8a7e3a7Sitojun p = (struct in6_prefix *)((caddr_t)p + advance); 1958d8a7e3a7Sitojun } 1959d8a7e3a7Sitojun 1960d8a7e3a7Sitojun if (oldp) { 1961d8a7e3a7Sitojun *oldlenp = l; /* (caddr_t)d - (caddr_t)oldp */ 1962d8a7e3a7Sitojun if (l > ol) 1963d8a7e3a7Sitojun error = ENOMEM; 1964d8a7e3a7Sitojun } else 1965d8a7e3a7Sitojun *oldlenp = l; 1966d8a7e3a7Sitojun 1967d8a7e3a7Sitojun splx(s); 1968d8a7e3a7Sitojun 1969d8a7e3a7Sitojun return (error); 1970d8a7e3a7Sitojun } 1971